主语从句基础知识

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主语从句讲解

主语从句1．定义：用作主语的从句叫做主语从句。

2．引导主语从句的关联词有三类：(1) 从属连词that、whether。

如：如：That they were in truth sisters was clear from the facial resemblance between them. 很明显，她们确是亲姐妹，她们的脸型很相似。

Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。

从属连词：that，whether等.that 引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。

由whether及其他连词引导的主语从句放在句首，句后都可。

If只能放在句中。

(2) （特殊疑问词）连接代词who, whom, whose, what, which, whoever, whatever, whichever如：__________watch was lost is unknown.不知道谁的表丢了。

__________she did is not yet known. 她干了什么尚不清楚。

__________side will win is not clear.__________comes is welcome. 不论谁来都欢迎。

__________?was?said?has?left?us?much?to?think. 这里说的话都应当保密。

造句：1. 我们需要的是时间。

2. 谁将成为我们的班长还没有决定。

3. 哪本书更好还不知道。

(3) （特殊疑问词）连接副词where, when, how, why，wherever，whenever，however。

1．主语从句能用it作形式上的主语。

常以it作形式主语的句型有：A. It+be+形容词(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, etc.)+that从句。

主语从句的用法与总结

主语从句的用法与总结主语从句是英语语法中的重要部分，它能够使句子更加丰富和灵活。

本文将介绍主语从句的用法，并给出一些实例进行说明。

1. 主语从句的基本概念主语从句是在句子中充当主语的从句，它可以取代一个名词或名词短语作为主语，使句子更具变化和表达能力。

主语从句通常由连接词引导，如that, whether, who, what, which等。

2. 引导主语从句的连接词2.1 that引导主语从句that引导的主语从句在口语和书面语中使用最为广泛。

它可以引导陈述句主语从句、主谓不完全的主语从句以及表示推测和建议的主语从句。

例如：- That he is guilty is beyond doubt. (陈述句主语从句)- That you know her well helps a lot. (主谓不完全的主语从句)- That she can succeed is uncertain. (表示推测和建议的主语从句)2.2 whether引导主语从句whether在句子中引导的主语从句一般用于判断选择或询问。

例如：- Whether he will come to the party is still uncertain.- I cannot decide whether I should go or stay.2.3 who, whom, whose引导主语从句who, whom, whose等是引导人的主语从句的连接词。

例如：- Who will be the next president is still unknown.- Whose book it is doesn't matter.2.4 what引导主语从句what引导的主语从句通常用于对事情或情况的描述。

例如：- What she said is quite true.- I don't understand what he means.2.5 which引导主语从句which引导的主语从句通常用于对特定选择的描述。

高考英语主语从句知识点

高考英语主语从句知识点主语从句是英语语法中的一个重要知识点，也是高考中经常考察的内容之一。

掌握主语从句的使用方法和注意事项，对于提高语法准确性和阅读理解能力都非常有帮助。

本文将介绍主语从句的定义、使用时的注意事项以及一些常见的主语从句的句型。

一、主语从句的定义主语从句是指在一个句子中充当主语的从句。

它通常由连词that, whether或if引导，也可以由关系代词what, who, which,whom等引导。

二、主语从句的使用注意事项1.主语从句的用法多样化，可以表示陈述、疑问、建议、要求等不同的意义。

在使用时需要根据具体语境进行选择。

2.如果主语从句谓语动词是不及物动词，需要用it作形式主语。

例如：It is important that we study hard.3.在表示是否时，通常用whether或if引导主语从句。

例如：Whether you go or not is up to you.4.在表示疑问句时，常用疑问词引导主语从句。

例如：What you said is not clear.5.当主语从句与主句的主语一致时，可以用it作形式主语。

例如：It's a pity that you missed the party.三、常见的主语从句句型1.由that引导的主语从句。

例如：That he is rich is well known.2.由wh-词引导的主语从句。

例如：What she said is true.3.由whether或if引导的主语从句。

例如：Whether he will come to the party remains to be seen.4.由it作形式主语的主语从句。

例如：It doesn't matter whether you come or not.5.句型：It is + adj. + that从句。

例如：It is important that we protect the environment.四、主语从句的练习题1. ______ you have any questions, please feel free to ask. (whether/if)2. ______ he will pass the exam is still unknown. (that)3. ______ are you going to give your presentation? (where)4. ______ I owe you an apology is obvious. (that)5. ______ he is doing now is to prepare for the final exam. (what)答案：1. Whether2. That3. Where4. That5. What通过以上介绍，我们了解了主语从句的定义、使用注意事项以及常见的句型。

主语从句高考知识点总结

一、主语从句的定义主语从句是一个句子中作主语的从句。

主语从句通常由连接词引导，例如that, whether, who, whom, whose, which, what, 等等。

主语从句在句子中担任主语的角色，也就是说，它起着说明中心事实或判断的作用。

二、主语从句的结构1. 连接词 + 主语从句连接词即引导主语从句的词语，常见的连接词有that, whether, who, whom, whose, which, what等。

例如：What he said is true.（他说的是真的。

）2. 主语从句 + 谓语 + 宾语/表语主语从句通常接在谓语动词之后，谓语之后可以是宾语或表语。

例如：Who will win the game is not yet known.（谁将赢得比赛尚未得知。

）三、主语从句的用法1. 说明中心事实或判断主语从句通常用来说明一个中心事实或判断，表示一个动作或状态。

例如：What he does is none of my business.（他做的事对我无关。

）2. 引出提问有时候主语从句用来引出提问，表示对某一事实或情况的疑问。

例如：What happened to Tom is still a mystery.（汤姆发生了什么事情还是个谜。

）3. 引导宾语从句有时主语从句还可以引导宾语从句。

例如：What he said is not true.（他说的不是真的。

）4. 引导表语从句主语从句也可以引导表语从句。

例如：What I want is a peaceful life.（我想要的是一种和平的生活。

）1. 主语从句中的谓语动词应该根据主语从句的人称和数保持一致。

例如：What he says is true.（他说的是真的。

）2. 主语从句中的连接词不能省略。

例如：I don’t know who will come.（我不知道谁会来。

）3. 主语从句中的连接词有时候可以省略。

主语从句用法详解(例句丰富)

主语从句用法详解(例句丰富)一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。

1. that引导That she is still alive is a consolation. 她还活着是使人感到宽慰的。

That she became an artist may have been due to her father's influence.她成为画家可能是受她父亲的影响。

That you are coming to London is the best news I have heard this long time.你将来伦敦是好久以来我听到的最好消息。

That she was chosen made a tremendous stir in her village.她被挑选上,在她村子里引起很大轰动。

2. whether引导Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。

Whether they would support us was a problem. 他们是否会支持我们还是一个问题。

3. 连接代词引导Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。

Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。

Whichever you want is yours. 你要哪个哪个就是你的。

4. 连接副词引导When we arrive doesn't matter. 什么时候到没有关系。

How it was done was a mystery. 这是怎样做的是一个谜。

主语从句知识点归纳总结

主语从句知识点归纳总结一、主语从句的引导词主语从句的引导词有两种情况，一种是以“疑问词”引导的主语从句，如 what, which, who, whom, whose, where, when, why, how；另一种是以“that” 引导的主语从句。

在口语中也可以用 whether 引导主语从句。

这两者的使用没有根本的区别。

二、主语从句的位置主语从句通常位于谓语动词之后，而在连接动词和宾语之间，有时还可用于某些固定句型的主语位置，如“It is+名词/形容词+that/who/whether…”，“There be 句型”等。

在复杂句中，主语从句通常位于主句之前三、主语从句需要注意的语法规则1. 主语从句在句中充当主语成分，主要用来说明主要动作的主体。

如：What he said is true.（他所说的是真的。

）2. 主语从句的谓语动词形式一般要和主句之间的逻辑关系保持一致，即主语从句的谓语动词的数和人称要和主句之间的主谓一致。

如：What he says is true.（他所说的是真的。

）3. 主语从句的谓语动词通常用单数形式，如其中的谓语动词用于表示整体和抽象概念的名词作主语。

表示数量的概念的名词作主语时，谓语动词用复数形式。

如：What she told me was very important.（她告诉我的事情很重要。

）4. 当主语从句中表示的内容是一个具体的个体时，“Who”引导的主语从句谓语动词的单复数形式要和先行词一致。

“Who”引导的主语从句用单数形式表示组织或公司时，谓语动词用单数形式。

表示具体的公司或组织名词作主语时，谓语动词要用单数形式。

如：The girl who is standing over there is my friend.（站在那边的那个女孩儿是我的朋友。

）The team that is winning a prize is from Beijing. （获奖的那个队是北京队。

主语从句讲解

宾语
1)连接代词 what (whatever ),
who ( whoever) , which (whichever), whom, whose .
连接代词引导主语从句，在句中作主语，宾语，表语，定语。
Which side will win is not clear. 定语 Who will write the poem has not been decided yet.主语 Whatever he did is right. 宾语 What the city will be still remains a mystery. 表语
It is certain that she will do well in her exam.
B. It + be + 名词词组 + that 从句 (an honour, a fact, a pity, etc）如：
It’s a pity that we can’t go.
C. It + be + 过去分词 + that 从句 (said, reported, thought, expected, decided, announced, etc。）如：
The earth became so violent that it was not clear whether the shape would last or not.
It was not immediately obvious that water was to be fundamental to the development of life.
Why they suddenly disappeared still remains a mystery.

高中英语知识点归纳主语从句的用法

高中英语知识点归纳主语从句的用法主语从句是英语语法中的一个重要知识点。

它用于修饰主句的主语，并在句子中起到名称、代词或名词性从句的作用。

通过使用主语从句，可以使句子结构更加丰富多样，表达更加具体清晰。

下面是对主语从句的用法进行归纳总结。

1. 引导主语从句的连接词：主语从句通常由从属连词引导，常用的引导词有：- That：常用于陈述句中，作为连接词引导主语从句。

例如：“That he is a talented singer is widely known.”- Whether/if：用于疑问句或选择句中，引导主语从句。

例如：“Whether he will come or not is still uncertain.”- Who/whom/whose：用于引导讨论人的主语从句。

例如：“Who will be the next president is under discussion.”- What/which：用于指代事物的主语从句。

例如：“What happened yesterday is beyond my control.”2. 主语从句在句子中的位置：主语从句通常在句子中作为主语出现，放在句首。

例如：“Why he left in such a hurry is still a mystery.”3. 动词形式与主语从句：主语从句的谓语动词形式与从句中的主语保持一致，即采用单数或复数形式。

例如：“What I want is a peaceful life.”4. 主语从句的时态：主语从句的时态通常与主句时态保持一致。

例如：“That she has passed the exam is a great relief to her parents.”5. 特殊情况下的主语从句：在某些特殊情况下，主语从句中的谓语动词应为不定式形式。

如：- It + be + 原形动词 + that从句：例如“It is important to study hard.”- There + be + 名词 + that从句：例如“There is no doubt that he is telling the truth.”通过对主语从句的学习与理解，可以更好地运用它，丰富句子结构，使语言表达更加准确、流畅。

(完整版)主语从句知识点大全

(完整版)主语从句知识点大全主语从句知识点大全
主语从句是复合句中最常用的从句之一，它在句中充当主语的成分。

下面是一些主语从句的知识点：
1. 主语从句的引导词：
- 连接代词：that, whether, who, whom, whose, which, what, whichever, whatever
- 连接副词：why, when, where, how
2. 位置：
主语从句通常出现在句首，但也可以出现在句中或句尾。

3. 用法：
主语从句可以代替一个句子或一个名词性词组作为整个句子的主语。

例如：
- What you said is true.（你说的是真的。

）
4. 时态和语态的变化：
当主语从句中的谓语动词表示客观事实、真理或普遍规律时，动词通常用一般现在时（注意，这里指的是从句中的动词，而不是主句的动词）。

例如：
- That she is knowledgeable is well-known.（她有学问是众所周知的。

）
- It is believed that the sun rises in the east.（人们相信太阳从东方升起。

）
5. 引导词的选择：
- 区别 that 和 whether：
- that 引导的主语从句一般用在陈述句中，表示“...是...”；
- whether 引导的主语从句一般用在疑问句中，表示“是否...”。

以上是关于主语从句的一些基本知识点，希望对你有所帮助！。

（完整版）主语从句详解

（完整版）主语从句详解主语从句详解一、概述在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用, 这类从句又可分为主语从句、同位语从句、表语从句和宾语从句.二、主语从句主要有四类（1）由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省.例如：That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.（2）用连词whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省. 注意：引导主语从句, 不能用if, 只能用whether.例如：Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn’t matt er too much.（3）用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用, 担当一定成分.例如：What you need is more practice. What I want to know is this.Whatever we do is to serve the people.注：whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义.它引导主语从句, 并在从句中作主语、宾语、表语等.whatever = anything that; whoever = anyone who.要注意和whatever, whoever引导的让步状语从句的区别.Whoever breaks the law should be punished. （主语从句）（＝Anyone who breaks the law should be punished. ）Whoever breaks the law, he should be punished. （让步状语从句）（＝No matter who breaks the law, he should be punished. ）（4）用连接副词when, where, why, how引导名词性从句(其连接副词有含义,在句中作状语.) 例如:Where we should leave it is a problem.When they will come hasn’t been made pubic.三、注意点: it构成的主语从句（1）由连词that引导的主语从句, 在多数情况下放到句子的后面, 而用代词it作形式主语. 例如：That light travels in straight lines is known to all.=It is known to all that light travels in straight lines.When the plane is to take off has not been announced .= It has not been announced when the plane is to take off.(但当what引导的主语从句表示“…的东西”时, 一般不用it作形式主语.)错:It is a book what he wants.对:What he wants is a book.另外, 需要注意的是, it作形式主语代替主语从句时, 要注意和as引导的定语从句的区别.试比较：It was reported that the US was under the terrorist attack.As was reported, the US was under the terrorist attack.（2）常见用it作形式主语的复合句结构A. It is +名词+从句It is a fact that… 事实是……It is good news that … ……是好消息It is a question that … ……是个问题It is common knowledge that … ……是常识类似的名词还有：a pity；a wonder；a good thing；no wonder；surprise等.例如：It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.It’s a pity that you missed the film.B. It is +形容词+从句It is necessary that … 有必要……It is clear that … 很清楚……It is likely that … 很可能……It is important that … 重要的是……类似的形容词还有：Strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.例如：It is doubtful whether she will be able to come.It was really astonishing that he refused to talk to you.It is essential that he should be here by the weekend.It seems obvious that we cannot go on like this.It is necessary that you （should）master the computer.It is important that a student learn English well.It is likely that a hurricane will arrive soon.需要注意的是, 这类主语从句中, 谓语动词很多为“（should）＋动词原形”, 即要用虚拟语气.C. It is +过去分词+从句It is said that … 据说……It is reported that … 据报道……It has been proved that … 已证明……It must be pro ved that… 必须指出……类似的过去分词还有：known; estimated; expected; believed;thought; hoped; noted; discussed; required;decided; suggested; demanded; made clear; found out,etc.例如：It is thought that he is the best player.It is estimated that the vase is 2000 years old.It is used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.It is said that he was killed in the earthquake.D. It seems（happened / appears / doesn’t matter / makes no difference / occurred …）that …It seems that they will win the game.It makes no difference whether he will attend the meeting or not.It does not matter if I missed my train.It happened that I saw him yesterday.主从练习1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimatedC. They are estimatedD. It is estimated that2. _____ some mammals came to live in the sea is not known.A. WhichB. SinceC. AlthoughD. How3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ wealthy does not necessarily mean that a man is greedy.A. For the reason that he isB. Just because he isC. The reason of beingD. That he is5. Although ___ happened in this developed country sounds like science fiction, it could occur elsewhere in the world.A. whichB. whatC. howD. it6. _____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC. To her that occurredD. It occurred to her that7. I am sure that _____ she said is wrong.A. whichB. allC. thisD. what8. We lost our way in the forest, and ____ made matters worse was that it was getting dark.A. thatB. whichC. itD. What9. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming10. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether11. ______ he is at work in the heart of the big city or at home in the quiet suburb, Dick’s l ife is tied to machines.A. WhetherB. TillC. IfD. Unless12. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which13. _____ is warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need14. _____ is a pity that he should feel so upset.A. WhatC. HeD. It15. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.A. RemarkableB. Quite remarkablyC. It is remarkable thatD. It is remarkable fact that16. _____ you nominate will be elected.A. WhoB. WhomC. WhomeverD. That’s17. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s18. _____ of us gets home first starts cooking.A. WhoB. WhichC. WhicheverD. Anyone1.________ makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever2. It worried her a bit ____ her hair was turning grey.B. thatC. ifD. for3.When and why he came here ________ yet.A. is not knownB. are not knownC. has not knownD. have not known4. ________ is no reason for dismissing her.A. Because she was a few minutes lateB. Owing to a few minutes lateC. The fact that she was a few minutes lateD. Being a few minutes late5. ________ Tom liked to eat was different from ________.A. That…that you had expectedB. What …that you had expectedC. That…what you had expectedD. What…what you had expected6.________ we go swimming every day ________ us a lot of good.A. If...doB. That...doC. If...doesD. That...does7.It ________ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that8.It's uncertain ________ the experiment is worth doing.A. ifB. thatC. whetherD. how9.________ the boy didn't take medicine made his mother angry.A. ThatB. WhatC. HowD. Which10.____ we can't get seems better than ____ we have.A. What, whatB. What, thatC. That, thatD. That, what11.____ you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether12..____ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where13._________is going to do the job will be decided by the Party committee.A. ThatB. WhyC. HowD. Who14._______we'll finish translating the book depends on the time.A. WhenB. WhyC. WhatD. That15.______he won't go there is clear to all of us.A. HowB. WhatC. WhyD. This16.______the house will be built will be discussed at tomorrow's meeting.A. IfB. WhereC. ThatD. What17._______you come or not is up to you.A. WhatB. IfC. WhyD. Whether18._______makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody19._______team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How20. Who is this factory __________ some foreign friends visited last Friday?A. thatB. whereC. whichD. the one21.Is this factory you visited the other day?A. thatB. whereC. in whichD. the one22.________leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD.Who表语从句1、概述用作表语的从句叫作表语从句, 它位于主句中的连系动词之后.引导表语从句的词有从属连词that、whether、as though(if)；关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等；关系副词when, where, why, how, however, whenever, wherever等.可以接表语从句的连系动词由be, look, remain, seem等.That引导表语从句时, 在口语中, 间或可以省略.The trouble is that we are short of money.困难是我们资金短缺.That is why stone walls are used instead of fences aroundNew England fields.这就是为什么在新英格兰用石头墙而不用栅栏的原因.At that time, it seemed as if I couldn't think of the right word anyhow.当时,我似乎怎么也想不出一个恰当的字眼来.2、由从属连词that, whether引导的表语从句.that在引导表语从句时无词义, 而whether有词义, 意为、“是否”.这时主句的主语常常是些抽象名词, 如question(问题), trouble(麻烦), problem(问题), result(结果), chance(可能性), suggestion(建议), idea(想法), reason(理由)等.表语从句对主句主语进行说明、解释, 使主语的内容具体化.The trouble is (that) she has lost his money. 麻烦的事是他丢了钱.The question is whether we need more ice cream.问题是我们是否还需要一些冰淇淋.The problem was that it was too valuable for everyday use.问题是它作为日常之用太贵重了. What she couldn’t understand was that fewer and fewer students showed interest in her l essons. 我们不能理解越来越少的学生对他的课不感兴趣.3、由关系代词引导的表语从句.关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等引导表语从句, 在句中作主语、宾语、表语, 关系代词不能省略.The question is which of us should go.问题是我们哪一个应该去.The problem was who could do the work.问题是谁能做这项工作.That's what he is worrying about.那就是他在担心的事.That's what we should do.那是我们应该做的.4、由关系副词引导的表语从句.Go and get your coat. It's where you left it. 去把雨衣拿来.就在你原来放的地方.I had nei ther a raincoat nor an umbrella. That’s why I got wet through. 我们既没伞也没雨衣, 这是我们淋湿的原因.That is how mice ruin many stores of grain every year.那就是老鼠是怎样每年损害大量粮食的. That is what he is worried about.那就是他所担心的.5、由连词because, as if/as though等引导的表语从句.It looked as if it was going to snow.看起来好像要下雪了.That's because we never thought of it.这是因为我们从未想过此事.It see ms as if he didn’t know the answer.好像他不知道答案.可以接表语从句的系动词有：1：be（being,been,am,is,are,was,were)2: feel , seem , look, appear ,sound,taste , smell3: stand , lie , remain ,keep, stay4: become ,get , grow , turn ,go ,come, run,fall5: prove, turn out系动词的固定搭配:come true, fall asleep, fall ill, go bad, come right, run wild连接词：that / whether /as if /asthough (if不引导表语从句)连接代词：who / whom / whose / which/ what连接副词：when / where / why / how /because注：引导表语从句的连词that间或可以省略.The truth is（that）I didn't go there. 事实是我没去那儿.［考题1］The traditional view is ____ we sleep because ourbrain is “programmed” to make us do so.A. whenB. whyC. whetherD. that［答案］ D［解析］下划线处之后是包含一个原因状语从句的表语从句, 如果看不出它是充当整个句子结构的表语从句将难以把握整个句子的意思.因此, 应选择可引导名词性从句且不充当任何成分的that.［考题2］You are saying that everyone should be equal, and this is ____ I disagree.A. whyB. whereC. whatD. how［答案］ B［解析］下划线处的引导词引导系动词is后的表语从句并在该表语从句中充当地点状语(“disagree”属于不及物动词, “I disagree”本身是完整的主谓结构), 下划线应填入引导词where, 表语从句“where I disagree”的意思是“我不同意之处、我不同意的地方”.［考题3］— I drove to Zhuhai for the air show last week.— Is that ____ you had a few days off?A. whyB. whenC. whatD. where［答案］ A［解析］下划线处的引导词引导与系动词is连用的表语从句并在该表语从句中充当原因状语, 下划线应填入表示“因此……”(指因某种原因所造成的结果)的引导词why.［考题4］____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons.A. What; whyB. That; whatC. What; becauseD. Why; that［答案］ A［解析］第一个下划线处的引导词引导主语从句并在该主语从句中充当宾语, 特指她所不理解的事情, 应填入关系代词型的引导词what；第二个下划线处表示“因此……”(指因某种原因所造成的后果, 由why 引导对应的名词性从句)而不是“为什么……”(指原因、理由, 由because引导对应的名词性从句), 应填入引导词why.［考题5］____ made the school proud was ____ more than 90% of the students had been admitted to key universities.A. What; becauseB. What; thatC. That; whatD. That; because［答案］ B［解析］第一个下划线处的引导词引导主语从句并在该主语从句中充当主语, 特指令校方骄傲的事情, 应选用关系代词型的引导词what；第二个下划线处引导表语从句表示原因、理由, 应由that引导对应的名词性从句.［考题6］—Are you still thinking about yesterday’s game?—Oh, that’s ____.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited［答案］ A［解析］A选项的意思是“令我感觉激动的事物”；B选项的意思是“我觉得激动的任何事物”；C选项的意思是“我对它感觉的方式”；D选项的意思是“令我感觉激动的时间”.四个选项中A最适合跟代表“game”的主语that对应, 充当表语从句.表语从句与宾语从句的关系不属于的宾语从句和表语从句都属于名词性从句.其作用跟名词在句中的作用相同.故充当宾语的句子叫宾语从句, 充当表语的句子叫表语从句.宾语从句(1)对于宾语从句要掌握以下三点①语序: 从句的语序必须是陈述句语序, 即“主语+ 谓语”这种形式.②时态: 当主句是一般现在时或一般将来时的时候, 从句可以是任何时态, 而当主句是一般过去时的时候, 从句, 从句时态必须是过去时范围的时态, 即(一般过去时, 过去进行时, 过去完成时, 过去将来时).③连接词: 当从句意思完整, 主句意思肯定时, 连接词用that, 且可以省去, 当从句意思完整, 主句意思不确定或含否定含意时, 常用if或whether(是否), 当从句意思不完整时, 连接词则是代替不完整部分的特殊疑问词.表语从句在句子中起表语作用的从句叫做表语从句, 位于主句系动词的后面.表语从句的引导词和主语从句的引导词相同.也是名词性从句的一种.如：What the police want to know is when you enred red the room警察想知道的是你什么时候进的房间.The The trouble is that we are short of funds困难是我们缺乏资金.This This is what we should do这是我们应当做的.That”s s why I want you to work there那就是我要你在那儿工作的原因.His His first question was whether Mr. Smith had arrived yet 他的第一个问题是史密斯先生到了没有.注意：从句中的疑问句用正常语序, 即陈述语序.as as if, as though, becau也可用来引导表语从句.She She seems as if she had done a great thing她看起来好像做了一件大事.It It is because you eat too much那是因为你吃得太多了.表从练习一1. The question is ________ we will have our sports meet next week.A. thatB. ifC. whenD. whether 2．The reason why he failed is ________he was too careless.A. becauseB. thatC. forD. because of3. Go and get your coat. It’ s ________you left itA. whereB. thereC. there whereD. where there 4．The problem is _________to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us.A. thatB. ifC. whetherD.不填6. The reason is_________I missed the bus.A. thatB. whenC. whyD. what7. That is __ ___ we were late last time.A. thatB. whenC. whyD. what8. She looked _________ she were ten years younger.A. thatB. likeC. asD. as though9.—I fell sick!--I think it is _______ you are doing too much.A. whyB. whenC. whatD. because10. The reason why he hasn’t come is ___________.A. because his mother is illB. because of his mother’s being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much.A. thatB. whatC. whyD. how12.That is ______ Lu Xun once lived.A. whatB. whereC. thatD. Why二1．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are2. The trouble is__________we are short of tools.A. whatB. thatC. howD. why that3. America was __________was first called “India” by Columbus.A. whatB. whereC. the placeD. there where4. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be5. ________he really means is ________he disagrees with us.A. What … thatB. That … whatC. What … whatD. That … what6. The energy is ________ makes the cells able to do their work.A. thatB. whichC. whatD. Such三1. I drove to Zhuhai for the air show last week .—Is that_____ you had a few days off？A. why B .what C. when D. where2. I had neither a raincoat nor an umbrella ____I got wet through.A. It’s the reasonB. That’s whyC. There’s whyD. It’s how3. See the flags on top of the building? That was ______ we did this morning.A. whenB. whichC. whereD. what4. --- Are you still thinking about yesterday’s game?---Oh, that’s _____.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited5. What surprised me was not what he said but ______ he said it.A. the wayB. in the way thatC. in the wayD. the way which1.The question is ________ we will have our sports meet next week.A. thatB. ifC. whenD. whether 2．The reason why he failed is ________he was too careless.A. becauseB. thatC. forD. because of3. Go and get your coat. It’ s ________you left itA. whereB. thereC. there whereD. where there 4．The problem is _________to take the placeof TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us.A. thatB. ifC. whetherD.不填6. The reason is_________ I missed the bus.A. thatB. whenC. whyD. what7. That is __ ___ we were late last time.A. thatB. whenC. whyD. what8. She looked _________ she were ten years younger.A. thatB. likeC. asD. as though9.—I fell sick!--I think it is _______ you are doing too much.A. whyB. whenC. whatD. because10. The reason why he hasn’t come is ___________.A. because his mother is illB. because of his mother’s being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much.A. thatB. whatC. whyD. how12.That is ______ Lu Xun once lived.A. whatB. whereC. thatD. why 13．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are14. The trouble is__________ we are short of tools.A. whatB. thatC. howD. why that15. America was __________was first called “India” by Columbus.A. whatB. whereC. the placeD. there where16. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be17. ________he really means is ________he disagrees with us.A. What … thatB. That … whatC. What … whatD. That … what18. The energy is ________ makes the cells able to do their work.A. thatB. whichC. whatD. such19 —I drove to Zhuhai for the air show last week.—Is that_____ you had a few days off？A. why B .what C. when D. where20 .I had neither a raincoat nor an umbrella ____I got wet through.A. It’s the reasonB. That’s whyC. There’s whyD. It’s how21. See the flags on top of the building? That was ______ wedid this morning.A. whenB. whichC. whereD. what22. --- Are you still thinking about yesterday’s game?---Oh, that’s _____.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited23. What surprised me was not what he said but ______ he said it.A. the wayB. in the way thatC. in the wayD. the way which综合练习1. It has been proved _________ eating vegetables in childhood helps to protect you against serious illnesses in later life.A. ifB. becauseC. whenD. that2. The last time we had great fun was ________ we were visiting the Water Park.A. whereB. howC. whenD. why3. ________ matters most in learning English is enough practice.A. WhatB. WhyC. WhereD. Which4. The traditional view is ______ we sleep because our brain is “programmed” to make use do so.A. whenB. whyC. whetherD. that5. ______ parents say and do has a life-long effect on their children.A. ThatB. WhichC. WhatD. As6.________ is our belief that improvements in health care will lead to a stronger, more prosperous economy.A. AsB. ThatC. ThisD. It7. ______ team wins on Saturday will go through to the national championships.A. No matter whatB. No matter whichC. WhateverD. Whichever8. You are saying that everyone should be equal, and this is ______ I disagree.A. whyB. whereC. what .D how9. After Yang Liwei succeeded in circling the earth, ____ our astronauts desire to do is walk in space.A. whereB. whatC. thatD. how10. I think Father would like to know ______ I’ve been up to so far, so I decide to send him a quick note.A. whichB. whyC. whatD. how11. Our country is developing at an amazing speed, and this is ______ makes me feel so proud.A. whatB. whichC. thatD. why12. ________ puzzles the scientists how these creatures can survive in such severe conditions.A. WhatB. AsC. ThatD. It13. _____ leaves the room last ought to turn off the lights.A. AnyoneB. WhoC. WhoeverD. The person14. Inside the White House, there is a room called the Oval Office. That’s _______ the president works.A. wheyB. whenC. whatD. where15. ______ you will be admitted to York University will be decided by the Admission Committee.A. ThatB. WhetherC. WhatD. If16. The reason ____ I plan to go is _____ she will be disappointed if I don’t.A. why; thatB. that; becauseC. which; becauseD. why; for17. We sell handmade gifts. _____gift you order from us is unique for the special person!A. WhichB. ThatC. WhicheverD. What。

主语从句全部用法总结归纳

主语从句全部用法总结归纳主语从句是句子中的一个从句，用作主语。

它在句子中起到了一个非常重要的作用，使得句子结构更加丰富，表达更加准确。

本文将对主语从句的全部用法进行总结归纳，以帮助读者更好地理解和运用主语从句。

一、基础用法1. 可以使用疑问词引导主语从句可以由疑问词引导，例如：what, who, which, when, where, why, how等，如："What you said doesn't make sense."（你说的话没有意义。

）"Who will be in charge of the project remains unknown."（谁将负责这个项目仍未知。

）"Which team will win the championship is still uncertain."（哪个队会赢得冠军尚不确定。

）2. 可以使用连接代词引导主语从句还可以由连接代词引导，例如：that, whether等，如："That he succeeded is beyond doubt."（他成功了是毫无疑问的。

）"Whether she will come to the party is still uncertain."（她是否会来参加派对尚不确定。

）3. 可以使用连接副词引导此外，主语从句也可以由连接副词引导，例如：how, when, where 等，如："How he managed to solve the problem remains a mystery."（他如何成功解决问题仍然是个谜。

）"When we will meet again is still unknown."（我们何时能够再次见面仍未知。

）二、特殊用法1. 否定形式的主语从句在主语从句中，如果谓语部分是一个否定形式，通常要用否定的疑问词将从句引导出来，如："Nobody knows what he is up to."（没有人知道他在搞什么鬼。

主语从句课件

事项。
05 主语从句常见错误分析
引导词选用错误
总结词
错误地使用主语从句的引导词是常见的语法错误之一。
详细描述
在主语从句中，引导词的作用是连接主句和从句，并指明从句的成分。常见的引导词包括that、whether、who、what、where等。然而，在使用过程中，学生们往往会出现选用错误的情况，导致句子结构不正确，意思表达不清晰。
语义功能
形式主语可以表达句子的语义，使句子更加清晰明了。
语用功能
形式主语可以表达说话者的意图，使句子更加流畅自然。
主语从句与形式主语的选用
句子结构
当主语较长或需要强调时，可以选择使用形式主语来代替主语从句，使句子结构更加简洁明了。
语义表达
当需要表达较为复杂的语义时，可以选择使用主语从句来表达，使句子更加清晰易懂。
总结词
主语从句的时态和语序错误会导致句子意思的扭曲和误解。
详细描述
在主语从句中，时态和语序的错误使用常常会导致句子的意思与实际不符。例如，学生们可能会在描述过去发生的事情时使用现在时态，或者在描述将来发生的事情时使用过去时态，这都会导致句子的意思变得模糊不清。此外，主语从句的语序也应当遵循一定的规则，以确保句子意思的清晰表达。
强调语序
为了强调主语从句中的某个成分，可以采用强调语序，即在从句中加上"It was…that…"的结构。例如：It was he that saved the drowning girl.（是他拯救了溺水的女孩。）
04 主语从句与形式主语的比较
形式主语的特点
01
02
03
语法功能
形式主语可以起到语法功能的作用，使句子结构更加完整。

主语从句超全

• 需要先将疑问句的倒装语序变成陈述句语序，并在句首加上whether来引导，以保留原句的疑问意义。
Whether he will come to my party makes no difference to me. 他来不来参加我的聚会对我来说无所谓。
特殊疑问句作主语
• 需要先将疑问句的倒装语序变成陈述句语序。 Why dinosaurs became extinct is still a mystery. Why did dinosaurs become extinct is still a mystery. 恐龙为什么会灭绝目前还是个未解之谜。
3) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起…
It happened that 刚好)I came into the office *________________( at that time.
*____________________( It occurred to me that 我突然想起)I forget to sent the letter.
第二讲：主语从句的引导词及各类主语从句
主语从句在复合句中作句子的主语。
引导主语从句的词有从属连词that, whether, if；连接代词who, whoever, whom, what, whatever, whose, which；连接副词when, where, how, why等。
一.that 引导
It is a pity that 很遗憾)we lost the match. *_______________( It is a fact that 这是事实)he cheated in the exam. *______________(

大学主语从句知识点总结

大学主语从句知识点总结一、主语从句的定义主语从句是指在一个句子中充当主语的从句。

主语从句通常由连接词引导，连接词通常有that, whether, who, whom, which, whoever, whomever, whatever等。

主语从句通常置于谓语动词之前，从句与主句之间用逗号或者冒号隔开。

例句：- Who will win the game is still unknown.- Whether we should go camping depends on the weather.- It is clear that the project has been finished on time.二、主语从句的用法主语从句的使用是为了使句子更加简洁明了，同时主语从句可以替代主语部分，使句子结构更加丰富。

主语从句通常出现在it is/ was/ has been/ will be... that...，it seems that...等句型中。

例句：- It is a pity that he missed the train.- It seems that she has lost her key.三、主语从句的特点1. 主语从句通常由连词引导，常见的引导连词有that, whether, who, whom, which, whoever, whomever, whatever等。

2. 主语从句通常出现在it is/ was/ has been/ will be... that...，it seems that...等句型中。

3. 主语从句在句子中的作用是充当主语成分，从而使句子更加简洁明了。

4. 主语从句通常置于谓语动词之前，从句与主句之间用逗号或者冒号隔开。

四、主语从句的常见错误和注意事项1. 不需要在主语从句前加上it，例如错误句子：It is whether we should go camping depends on the weather.2. 主语从句不能用于there be结构中，例如错误句子：There is who will win the game is still unknown.3. 主语从句的动词应该使用单数形式，例如错误句子：What make her happy are flowers.4. 主语从句中的谓语动词应与主句的谓语动词保持一致，例如错误句子：Who are go to the party tonight is still unknown.5. 主语从句中的代词应该与其先行词在数、人称和性别上保持一致，例如错误句子：Whoever wants to come to the party, she is welcome.总之，主语从句是英语语法中的一个重要知识点，在英语学习中需要重点掌握。

名词性从句-主语从句

主语从句的构成
主语从句的构成包括引导词和陈述句两部分。引导词是主语从句的开头，陈述句则是主语从句的具体内容。
例如：“That he will come is certain.”这个句子中，“that”是引导词，“he will come”是陈述句，合起来构成了主语从句“that he will come”。

特殊情况下的语序变化
在某些特殊情况下，如强调或倒装句中，主语从句的语序可能会发生变化。例如，“It is he who is responsible for the accident.”（是他负责这起事故。）
主语从句的省略
省略条件
主语从句在某些情况下可以省略，通常是在从句内容与主句内容重复或从句内容不重要的情况下。
THANKS
感谢观看
名词性从句-主语从句
目录
• 主语从句的定义 • 主语从句的引导词 • 主语从句的句型结构 • 主语从句的用法 • 主语从句的注意事项
01
主语从句的定义
什么是主语从句
主语从句是名词性从句的一种，在句子中充当主语成分，表示句子中的主要内容。主语从句通常由一个连词引导，如that、whether等，后面跟随一个完整的句子。
引导词who
总结词
表示人或身份
详细描述
who作为主语从句的引导词，通常表示人或身份，在句子中起到连接主语和谓语的作用。例如，“Who will win the game is still unknown.”（谁将赢得比赛仍然未知。）
引导词which
总结词
表示选择或范围
详细描述
which作为主语从句的引导词，通常表示选择或范围，在句子中起到连接主语和谓语的作用。例如，“Which team will win the game is still unknown.” （哪个队将赢得比赛仍然未知。）

202X年高中英语语法精讲之主语从句详细讲解

千里之行，始于足下。

202X年高中英语语法精讲之主语从句详细讲解主语从句是指在一个句子中充当主语的从句。

下面是202X年高中英语语法精讲之主语从句的详细讲解：1. 主语从句的引导词：主语从句的引导词有：that, whether/if。

例如：- That he has passed the exam is good news.- Whether he will come to the party is still unknown.- If it will rain tomorrow worries me.2. 主语从句的用法：（1）主语从句可以替代整个句子作为主语。

例如：- What he said is true. (He said something.)- Whether you like it or not doesn't matter. (You like it or not doesn't matter.)（2）主语从句的谓语动词通常为单数形式，与从句中的主语一致。

例如：- What she wants is a new car. (What she wants = She wants a new car.)- Whether he is responsible for the accident is still under investigation. (Whether he is responsible for the accident = He is responsible for the accident.)3. 主语从句的位置：第1页/共2页锲而不舍，金石可镂。

通常，主语从句位于句首，后面跟着一个逗号。

但如果主句以it作为形式主语，主语从句则位于句尾。

例如：- How the accident happened is still a mystery. (主语从句位于句首) - It is a mystery how the accident happened. (主语从句位于句尾)4. 不定式作主语：不定式也可以作为主语，表示未定的动作或状态。

(完整)高中英语主语从句全面讲解

语法——Noun clauses as the subject主语从句如果一个句子在复合句中充当一个主语, 那么这个句子就是主语从句。

①That he finished writing the composition in such a short time surprised us all.②What we need are good doctors.③Whom we must study for is a question of great importance.1.主语从句的连接词1).连接词: that, whether①.That he will win is certain.②.Whether he’ll join us in the discussion is of great importance.2).连接代词: who, what, which, whom , whose, whoever, whatever, whichever①.It is clear who is afraid of having a change in land ownership.②.What India needs is a law to make land ownership fairer.3).连接副词: when, where, why, how, how many, how much , how long, how soon, how often①When we’ll start tomorrow will be told soon.②Where we can buy oxen is something we need to find out.③Why he came here is not known.④How we can protect the grain from damp needs to be discussed.【连接词】1. that——That t he earth moves around the sun is well known.2. whether——Whether he will come or not is not known yet.3. who ——Who will be sent there has not been decided.4. what——What you need is more practice.5. which——Which one is the best is not clear.6. when, where ——Where he has gone is a question.7. why, how——Why there is gravity is hard to understand.How he can earn a living in Britain remains a big problem.8. whoever、whatever、whichever可引导主语从句。

【高中英语】高中英语知识点：主语从句

【高中英语】高中英语知识点：主语从句主语从句的概念：如果一个句子在复合句中充当一个主语，那么这个句子就是主语从句。

主语从句通常由从属连词that，whether，if和连接代词what，who，whichwhatever，whoever以及连接副词how，when，where，why等词引导。

that在句中无词义，只起连接作用。

主语从句用法：1、主语从句的引导词：主语从句通常由连词that和whether、相连接代词或相连接副词以及关系代词型what鼓励：如：thatheisstillaliveisawonder.他还活着，真是奇迹。

whenwearrivedoesn'tmatter.什么时候至没关系。

whatweneedismoney.我们需要的是钱。

whatiwanttoknowisthis.我想要晓得的就是这一点。

whethertheywouldsupportuswasaproblem.他们是否会支持我们还是一个问题。

2、主语从句与形式主语it：有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。

这分三种情况：(1)对于以连词that鼓励的主语从句，通常用形式主语代主语从句：(2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句：例如：whethertheywouldsupportuswasaproblem.他们与否可以积极支持我们还是一个问题。

itwasaproblemwhethertheywouldsupportus.他们是否会支持我们还是一个问题。

(3)对关系代词型what鼓励的主语从句，通常不必形式主语，总是主语从句放到句首：如：whatweneedismoney.我们需要的是钱。

whatiwanttoknowisthis.我想要晓得的就是这一点。

(4)如果句子是疑问句，则必须用带形式主语it的结构：例如：isittruethatheisthegirl'sfather?他就是那女孩的父亲，就是真的吗？howisitthatyouarelateagain?你怎么又迟到了？3、连词that的省略问题：引导主语从句的连词that有时可省，有时不能省，其原则是：若that鼓励的主语从句轻易坐落于句首，则that无法省略；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that则可以省略：例如：thatyoudidn'tgotothetalkwasapity.很惋惜你没回去听到报告。

第05讲主语从句

第05讲主语从句主语从句结构及用法在句子中担当主语的从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it 代替，而本身放在句子末尾。

通常结构为“引导词 + 主语 + 谓语 + 其他成分“。

一. 概念：在句子中担当主语的从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it 代替，而本身放在句子末尾。

主语从句使用陈述语序，其通常结构为“引导词 + 主语 + 谓语 + 其他成分”, 但当连接代词同时充当从句主语时，其结构为“连接代词 + 谓语 + 其他成分”。

二. 引导词：引导主语从句的词有连词：that, whether, if;连接代词：what, whatever, who, whoever, whom, whomever, whose, which, whichever;连接副词：when, whenever, where, wherever, how, however, why 。

1. 连词that, whether, if 引导的主语从句that 在主语从句中不作成分，没有意思，不能省略;whether 和if 虽不作句子的成分，但有“是否”的意思，且if 引导的主语从句不能位于句首。

内容要求主语从句 1.了解主语从句概念 2. 掌握主语从句引导词用法 3. 主语从句一些注意的问题知识讲解学习目标That she is still alive is a consolation. 她还活着是使人感到宽慰的。

That she became an artist may have been due to her father’s influence.她成为画家可能是受她父亲的影响。

Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。

Whether they would support us was a problem. 他们是否会支持我们还是一个问题。

完整word版主语从句详解

主语从句详解一、概述在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用, 这类从句又可分为主语从句、同位语从句、表语从句和宾语从句.二、主语从句主要有四类（1）由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省.例如：That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.（2）用连词whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省.注意：引导主语从句, 不能用if, 只能用whether.例如：Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn't matter too much.（3）用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用, 担当一定成分.例如：What you need is more practice. What I want to know is this.Whatever we do is to serve the people.注：whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义.它引导主语从句, 并在从句中作主语、宾语、表语等.whatever = anything that; whoever = anyone who.要注意和whatever, whoever引导的让步状语从句的区别.Whoever breaks the law should be punished. （主语从句）（＝Anyone who breaks the law should be punished. ）Whoever breaks the law, he should be punished. （让步状语从句）（＝No matter who breaks the law, he should be punished. ）（4）用连接副词when, where, why, how引导名词性从句(其连接副词有含义,在句中作状语.)例如:Where we should leave it is a problem.When they will come hasn't been made pubic.三、注意点: it构成的主语从句（1）由连词that引导的主语从句, 在多数情况下放到句子的后面, 而用代词it作形式主语.例如：That light travels in straight lines is known to all.=It is known to all that light travels in straight lines.When the plane is to take off has not been announced .= It has not been announced when the plane is to take off.(但当what引导的主语从句表示“…的东西”时, 一般不用it作形式主语.)错:It is a book what he wants.对:What he wants is a book.另外, 需要注意的是, it作形式主语代替主语从句时, 要注意和as引导的定语从句的区别.试比较：It was reported that the US was under the terrorist attack.As was reported, the US was under the terrorist attack.（2）常见用it作形式主语的复合句结构A. It is +名词+从句It is a fact that…事实是……It is good news that ………是好消息It is a question that ………是个问题It is common knowledge that ………是常识类似的名词还有：a pity；a wonder；a good thing；no wonder；surprise等.例如：It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.It's a pity that you missed the film.B. It is +形容词+从句It is necessary that …有必要……It is clear that …很清楚……It is likely that …很可能……It is important that …重要的是……类似的形容词还有：Strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.例如：It is doubtful whether she will be able to come.It was really astonishing that he refused to talk to you.It is essential that he should be here by the weekend.It seems obvious that we cannot go on like this.It is necessary that you （should）master the computer.It is important that a student learn English well.It is likely that a hurricane will arrive soon..即要用虚拟语气, ”＋动词原形）should（“谓语动词很多为, 这类主语从句中, 需要注意的是C. It is +过去分词+从句It is said that …据说……It is reported that …据报道……It has been proved that …已证明……It must be proved that…必须指出……类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required;decided; suggested; demanded; made clear; found out,etc.例如：It is thought that he is the best player.It is estimated that the vase is 2000 years old.It is used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.It is said that he was killed in the earthquake.D. It seems（happened / appears / doesn't matter / makes no difference / occurred …）that …It seems that they will win the game.It makes no difference whether he will attend the meeting or not.It does not matter if I missed my train.It happened that I saw him yesterday.主从练习1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimatedC. They are estimatedD. It is estimated that2. _____ some mammals came to live in the sea is not known.A. WhichB. SinceC. AlthoughD. How3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ wealthy does not necessarily mean that a man is greedy.A. For the reason that he isB. Just because he isC. The reason of beingD. That he is5. Although ___ happened in this developed country sounds like science fiction, it could occur elsewhere in the world.A. whichB. whatC. howD. it6. _____ she had forgotten to take her notebook.A. That occurred to herB. She occurred thatC. To her that occurredD. It occurred to her that7. I am sure that _____ she said is wrong.A. whichB. allC. thisD. what8. We lost our way in the forest, and ____ made matters worse was that it was getting dark.A. thatB. whichC. itD. What9. _____ or not is still uncertain.A. He's comingB. If he is comingC. That comingD. Whether he's coming10. It's _____ he'll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether11. ______ he is at work in the heart of the big city or at home in the quiet suburb, Dick's life is tied to machines.A. WhetherB. TillC. IfD. Unless12. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which13. _____ is warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need14. _____ is a pity that he should feel so upset.A. WhatB. ThatC. HeD. It15. _____ a spoonful of soil can tell us so much about the structure and early history of the moon.A. RemarkableB. Quite remarkablyC. It is remarkable thatD. It is remarkable fact that16. _____ you nominate will be elected.A. WhoB. WhomC. WhomeverD. That's17. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That's18. _____ of us gets home first starts cooking.A. WhoB. WhichC. WhicheverD. Anyone1.________ makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever2. It worried her a bit ____ her hair was turning grey.A. whileB. thatC. ifD. for3.When and why he came here ________ yet.A. is not knownB. are not knownC. has not knownD. have not known4. ________ is no reason for dismissing her.A. Because she was a few minutes lateB. Owing to a few minutes lateC. The fact that she was a few minutes lateD. Being a few minutes late5. ________ Tom liked to eat was different from ________.A. That…that you had expectedB. What …that you had expectedC. That…what you had expectedD. What…what you had expected6.________ we go swimming every day ________ us a lot of good.A. If...doB. That...doC. If...doesD. That...does7.It ________ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that8.It's uncertain ________ the experiment is worth doing.A. ifB. thatC. whetherD. how9.________ the boy didn't take medicine made his mother angry.A. ThatB. WhatC. HowD. Which10.____ we can't get seems better than ____ we have.A. What, whatB. What, thatC. That, thatD. That, what11.____ you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether12..____ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where13._________is going to do the job will be decided by the Party committee.A. ThatB. WhyC. HowD. Who14._______we'll finish translating the book depends on the time.A. WhenB. WhyC. WhatD. That15.______he won't go there is clear to all of us.A. HowB. WhatC. WhyD. This16.______the house will be built will be discussed at tomorrow's meeting.A. IfB. WhereC. ThatD. What17._______you come or not is up to you.A. WhatB. IfC. WhyD. Whether18._______makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody19._______team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How20. Who is this factory __________ some foreign friends visited last Friday?A. thatB. whereC. whichD. the one21.Is this factory you visited the other day?A. thatB. whereC. in whichD. the one22.________leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD.Who表语从句1、概述用作表语的从句叫作表语从句, 它位于主句中的连系动词之后.引导表语从句的词有从属连词that、whether、as though(if)；关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等；关系副词when, where, why, how, however, whenever, wherever等.可以接表语从句的连系动词由be, look, remain, seem等.That引导表语从句时, 在口语中, 间或可以省略. The trouble is that we are short of money.困难是我们资金短缺.That is why stone walls are used instead of fences around New England fields.这就是为什么在新英格兰用石头墙而不用栅栏的原因.At that time, it seemed as if I couldn't think of the right word anyhow.当时,我似乎怎么也想不出一个恰当的字眼来.2、由从属连词that, whether引导的表语从句.that在引导表语从句时无词义, 而whether有词义, 意为、“是否”.这时主句的主语常常是些抽象名词, 如question(问题), trouble(麻烦), problem(问题), result(结果), chance(可能性),suggestion(建议), idea(想法), reason(理由)等.表语从句对主句主语进行说明、解释, 使主语的内容具体化.The trouble is (that) she has lost his money. 麻烦的事是他丢了钱.The question is whether we need more ice cream.问题是我们是否还需要一些冰淇淋.The problem was that it was too valuable for everyday use.问题是它作为日常之用太贵重了.What she couldn't understand was that fewer and fewer students showed interest in her lessons.我们不能理解越来越少的学生对他的课不感兴趣.3、由关系代词引导的表语从句.关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever等引导表.关系代词不能省略, 在句中作主语、宾语、表语, 语从句．The question is which of us should go.问题是我们哪一个应该去.The problem was who could do the work.问题是谁能做这项工作.That's what he is worrying about.那就是他在担心的事.That's what we should do.那是我们应该做的.4、由关系副词引导的表语从句.Go and get your coat. It's where you left it. 去把雨衣拿来.就在你原来放的地方.I had neither a raincoat nor an umbrella. That's why I got wet through. 我们既没伞也没雨衣, 这是我们淋湿的原因.That is how mice ruin many stores of grain every year.那就是老鼠是怎样每年损害大量粮食的. That is what he is worried about.那就是他所担心的.5、由连词because, as if/as though等引导的表语从句.It looked as if it was going to snow.看起来好像要下雪了.That's because we never thought of it.这是因为我们从未想过此事.It seems as if he didn't know the answer.好像他不知道答案.可以接表语从句的系动词有：1：be（being,been,am,is,are,was,were)2: feel , seem , look, appear ,sound,taste , smell3: stand , lie , remain ,keep, stay4: become ,get , grow , turn ,go ,come, run,fall5: prove, turn out系动词的固定搭配:come true, fall asleep, fall ill, go bad, come right, run wild连接词：that / whether /as if /asthough (if不引导表语从句)连接代词：who / whom / whose / which/ what连接副词：when / where / why / how /because注：引导表语从句的连词that间或可以省略.The truth is（that）I didn't go there. 事实是我没去那儿.［考题1］The traditional view is ____ we sleep because our brain is “programmed”tomake us do so.A. whenB. whyC. whetherD. that［答案］ D［解析］下划线处之后是包含一个原因状语从句的表语从句, 如果看不出它是充当整个句子结构的表语从句将难以把握整个句子的意思.因此, 应选择可引导名词性从句且不充当任何成分的that.［考题2］You are saying that everyone should be equal, and this is ____ I disagree.A. whyB. whereC. whatD. how［答案］ B［解析］下划线处的引导词引导系动词is后的表语从句并在该表语从句中充当地点状语(“disagree”属于不及物动词, “I disagree”本身是完整的主谓结构), 下划线应填入引导词where, 表语从句“where I disagree”的意思是“我不同意之处、我不同意的地方”.［考题3］—I drove to Zhuhai for the air show last week.—Is that ____ you had a few days off?A. whyB. whenC. whatD. where［答案］ A［解析］下划线处的引导词引导与系动词is连用的表语从句并在该表语从句中充当原因状语, 下划线应填入表示“因此……”(指因某种原因所造成的结果)的引导词why.［考题4］____ she couldn't understand was ____ fewer and fewer students showedinterest in her lessons.A. What; whyB. That; whatC. What; becauseD. Why; that［答案］ A［解析］第一个下划线处的引导词引导主语从句并在该主语从句中充当宾语,特指她所不理解的事情, 应填入关系代词型的引导词what；第二个下划线处表示“因此……”(指因某种原因所造成的后果, 由why引导对应的名词性从句)而不是“为什么……”(指原因、理由, 由because引导对应的名词性从句), 应填入引导词why.［考题5］____ made the school proud was ____ more than 90% of the students hadbeen admitted to key universities.A. What; becauseB. What; thatC. That; whatD. That; because［答案］ B［解析］第一个下划线处的引导词引导主语从句并在该主语从句中充当主语,特指令校方骄傲的事情, 应选用关系代词型的引导词what；第二个下划线处引导表语从句表示原因、理由, 应由that引导对应的名词性从句.Are you still thinking about yesterday's game? —］6［考题—Oh, that's ____.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited［答案］ A［解析］A选项的意思是“令我感觉激动的事物”；B选项的意思是“我觉得激动的任何事物”；C选项的意思是“我对它感觉的方式”；D选项的意思是“令我感觉激动的时间”.四个选项中A最适合跟代表“game”的主语that对应, 充当表语从句.表语从句与宾语从句的关系不属于的宾语从句和表语从句都属于名词性从句.其作用跟名词在句中的作用相同.故充当宾语的句子叫宾语从句, 充当表语的句子叫表语从句.宾语从句(1)对于宾语从句要掌握以下三点①语序: 从句的语序必须是陈述句语序, 即“主语+ 谓语”这种形式.②时态: 当主句是一般现在时或一般将来时的时候, 从句可以是任何时态, 而当主句是一般过去时的时候, 从句, 从句时态必须是过去时范围的时态, 即(一般过去时, 过去进行时, 过去完成时, 过去将来时).③连接词: 当从句意思完整, 主句意思肯定时, 连接词用that, 且可以省去, 当从句意思完整, 主句意思不确定或含否定含意时, 常用if或whether(是否), 当从句意思不完整时, 连接词则是代替不完整部分的特殊疑问词.表语从句在句子中起表语作用的从句叫做表语从句, 位于主句系动词的后面.表语从句的引导词和主语从句的引导词相同.也是名词性从句的一种.如：What the police want to know is when you enred red the room警察想知道的是你什么时候进的房间.The The trouble is that we are short of funds困难是我们缺乏资金.This This is what we should do这是我们应当做的.That”s s why I want you to work there那就是我要你在那儿工作的原因.His His first question was whether Mr. Smith had arrived yet他的第一个问题是史密斯先生到了没有.注意：从句中的疑问句用正常语序, 即陈述语序.as as if, as though, becau也可用来引导表语从句.She She seems as if she had done a great thing她看起来好像做了一件大事.. 那是因为你吃得太多了It It is because you eat too much表从练习一1. The question is ________ we will have our sports meet next week.A. thatB. ifC. whenD. whether2．The reason why he failed is ________he was too careless.A. becauseB. thatC. forD. because of3. Go and get your coat. It' s ________you left itA. whereB. thereC. there whereD. where there4．The problem is _________to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us.A. thatB. ifC. whetherD.不填6. The reason is_________I missed the bus.A. thatB. whenC. whyD. what7. That is __ ___ we were late last time.A. thatB. whenC. whyD. what8. She looked _________ she were ten years younger.A. thatB. likeC. asD. as though9.—I fell sick!--I think it is _______ you are doing too much.A. whyB. whenC. whatD. because10. The reason why he hasn't come is ___________.A. because his mother is illB. because of his mother's being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much.A. thatB. whatC. whyD. how12.That is ______ Lu Xun once lived.A. whatB. whereC. thatD. Why二_______your father wants to know is________ getting on with your studies. ．1．A. What; how are youB. That；how you areC. How；that you areD. What；how you are2. The trouble is__________we are short of tools.A. whatB. thatC. howD. why that3. America was __________was first called “India”by Columbus.A. whatB. whereC. the placeD. there where4. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be5. ________he really means is ________he disagrees with us.A. What …thatB. That …whatC. What …whatD. That …what6. The energy is ________ makes the cells able to do their work.A. thatB. whichC. whatD. Such三1. I drove to Zhuhai for the air show last week .—Is that_____ you had a few days off？A. why B .what C. when D. where2. I had neither a raincoat nor an umbrella ____I got wet through.A. It's the reasonB. That's whyC. There's whyD. It's how3. See the flags on top of the building? That was ______ we did this morning.A. whenB. whichC. whereD. what4. --- Are you still thinking about yesterday's game?---Oh, that's _____.A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited5. What surprised me was not what he said but ______ he said it.A. the wayB. in the way thatC. in the wayD. the way which1.The question is ________ we will have our sports meet next week.A. thatB. ifC. whenD. whether2．The reason why he failed is ________he was too careless.D. because ofC. for B. that A. because3. Go and get your coat. It' s ________you left itA. whereB. thereC. there whereD. where there 4．The problem is _________to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us.A. thatB. ifC. whetherD.不填6. The reason is_________ I missed the bus.A. thatB. whenC. whyD. what7. That is __ ___ we were late last time.A. thatB. whenC. whyD. what8. She looked _________ she were ten years younger.A. thatB. likeC. asD. as though9.—I fell sick!--I think it is _______ you are doing too much.A. whyB. whenC. whatD. because10. The reason why he hasn't come is ___________.A. because his mother is illB. because of his mother's being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much.A. thatB. whatC. whyD. how12.That is ______ Lu Xun once lived.A. whatB. whereC. thatD. why 13．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are14. The trouble is__________ we are short of tools.A. whatB. thatC. howD. why that15. America was __________was first called “India”by Columbus.A. whatB. whereC. the placeD. there where16. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to beingC. what it used to beingD. what it was used to be17. ________he really means is ________he disagrees with us.A. What …thatB. That …whatC. What …whatD. That …what18. The energy is ________ makes the cells able to do their work.A. thatB. whichC. whatD. suchI drove to Zhuhai for the air show last week. —19？—Is that_____ you had a few days offD. where B .what C. when A. why____I got wet through. 20 .I had neither a raincoat nor an umbrellaD. It's howB. That's why C. There's why A. It's the reason21. See the flags on top of the building? That was ______ we did this morning.D. what C. where A. when B. whichAre you still thinking about yesterday's game?22. ---Oh, that's _____. ---B. whatever I feel excited about A. what makes me feel excitedD. when I feel excited C. how I feel about it23. What surprised me was not what he said but ______ he said it.D. the way which C. in the way A. the way B. in the way that综合练习1. It has been proved _________ eating vegetables in childhood helps to protect you against serious illnesses in later life.A. ifB. becauseC. whenD. that2. The last time we had great fun was ________ we were visiting the Water Park.A. whereB. howC. whenD. why3. ________ matters most in learning English is enough practice.A. WhatB. WhyC. WhereD. Which4. The traditional view is ______ we sleep because our brain is “programmed”to make use do so.A. whenB. whyC. whetherD. that5. ______ parents say and do has a life-long effect on their children.A. ThatB. WhichC. WhatD. As6.________ is our belief that improvements in health care will lead to a stronger, more prosperous economy.A. AsB. ThatC. ThisD. It7. ______ team wins on Saturday will go through to the national championships.A. No matter whatB. No matter whichC. WhateverD. Whichever8. You are saying that everyone should be equal, and this is ______ I disagree.A. whyB. whereC. what .D how9. After Yang Liwei succeeded in circling the earth, ____ our astronauts desire to do is walk in space.A. whereB. whatC. thatD. how10. I think Father would like to know ______ I've been up to so far, so I decide to send him aquick note.A. whichB. whyC. whatD. how11. Our country is developing at an amazing speed, and this is ______ makes me feel so proud.A. whatB. whichC. thatD. why12. ________ puzzles the scientists how these creatures can survive in such severe conditions.A. WhatB. AsC. ThatD. It13. _____ leaves the room last ought to turn off the lights.A. AnyoneB. WhoC. WhoeverD. The person14. Inside the White House, there is a room called the Oval Office. That's _______ the president works.A. wheyB. whenC. whatD. where15. ______ you will be admitted to York University will be decided by the Admission Committee.A. ThatB. WhetherC. WhatD. If16. The reason ____ I plan to go is _____ she will be disappointed if I don't.A. why; thatB. that; becauseC. which; becauseD. why; for17. We sell handmade gifts. _____gift you order from us is unique for the special person!A. WhichB. ThatC. WhicheverD. What。