主语从句
九种英语主语从句
九种英语主语从句英语中的主语从句是一种句子结构，用来作为句子的主语。
它可以替代一个名词，在句子中起主语的作用。
以下是九种常见的英语主语从句：1. 以that引导的主语从句主语从句以that引导，用来表达它所引导的内容是主要的或重要的。
例如：That he arrived late was disappointing.2. 以whether或if引导的主语从句主语从句以whether或if引导，用来表达对某件事情的疑问或是不确定。
例如：3. 以疑问词引导的主语从句主语从句以疑问词引导，用来回答对某事情的问题。
例如：What she said was really surprising.4. 以动词不定式引导的主语从句主语从句以动词不定式引导，用来表达对某件事情的目的或意图。
例如：To finish the project on time is our main goal.5. 以-ing形式引导的主语从句主语从句以-ing形式引导，用来表达对某事情的现实、可能或不可能。
例如：Swimming in the pool is not allowed.6. 以从属连词that引导的主语从句主语从句以从属连词that引导，用来表达对某事情的描述、判断或信念。
例如：That he is a talented musician is well-known.7. 以it作为形式主语引导的主语从句主语从句以it作为形式主语引导，而真实主语通常位于句子后部。
例如：It is important to have a healthy lifestyle.8. 以as if / as though引导的主语从句主语从句以as if或as though引导，用来表达对某事情的比喻、相似或假设。
例如：He acted as if he knew everything.9. 以现在分词引导的主语从句主语从句以现在分词引导，用来表达对某事情的原因、结果或条件。
主语从句
(2) It + be +形容词 +that 从句 It is certain that he will come.
(3) It + be +动词的过去分词 + that 从句 It is suggested that the meeting should be put off till next week. (4) It + 不及物动词+that 从句 It happens that they were absent.
study English hard.
2. 在句型it is required/ suggested / requested/ ordered that… 必须使用虚 拟语气，谓语动词用(should) do。 (1) It is suggested that Tom (should) have a rest. (2) It is required that I (should )be present.
(2) What I want is a cup of tea.
(四) 主语从句的固定句型 It is no wonder that… 难怪… It is siad/ reported/ hoped that… 据说/ 据报道/ 希望是…
(三) 主语从句的主谓一致 1. 主语从句表示抽象概念, 谓语动词用 单数形式。
When we hold the meeting is not
decided yet. 2. 表语是可数名词复数, 谓语动词用复 数; 表语是不可数名词, 谓语用单数。
(1) What I need are five desks.
2. 主语从句在大多数情况下放在句子后 部, 用it作形式主语。 (1) It + be +名词+that 从句 It is a fact that English is being accepted as an international language. It is a pity that you miss such a good journey.
什么是主语从句
什么是主语从句？主语从句是指在一个句子中，作为主语的从句。
从句是由一个连接词引导的子句，它具有主语的功能，并在句子中起到主语的作用。
主语从句通常由连接词“that”、“whether”、“if”、“who”、“what”、“which”等引导。
以下是一些关于主语从句的例子：1. That从句：- "That he is late is not surprising."（他迟到并不令人惊讶。
）这个从句“That he is late”起到整个句子的主语作用。
2. Whether或If从句：- "Whether she will come to the party is still uncertain."（她是否会来参加派对还不确定。
）这个从句“Whether she will come to the party”作为整个句子的主语。
3. Wh-从句：- "Who will win the game is yet to be determined."（谁会赢得比赛还有待确定。
）这个从句“Who will win the game”起到整个句子的主语作用。
4. What从句：- "What she said was very inspiring."（她说的话非常鼓舞人心。
）这个从句“What she said”作为整个句子的主语。
5. Which从句：- "Which book to read is up to you."（读哪本书由你决定。
）这个从句“Which book to read”起到整个句子的主语作用。
主语从句在句子中起到主语的作用，它可以是句子的焦点，也可以用来引入一个话题或提出一个问题。
使用主语从句可以使句子更加丰富多样，并且可以帮助我们表达更复杂的思想。
在使用主语从句时，需要注意以下几点：-主语从句通常位于句子的开头或主语之后。
主语从句
主语从句(subject clauses)1、概述在复合句中起主语作用的从句叫主语从句。
引导主语从句的词有从属连词、、关系代词、连接副词等。
引导主语从句的关联词有从属连词that、whether，关系代词：who, what, which , whom, whose, whatever, whoever, whomever, whichever；关系副词：when, where, how, why, however, whenever, wherever等。
That you don’t like him is none of my business.你不喜欢她不管我的事。
What he said is true. 他说的是真的。
Do you remember how he arrived almost at the end of the party?你记得他几乎是在宴会快结束时才到的吗？This party's really where it's at, man! 啊，这个晚会真棒！Tell us how you fulfilled the heavy task ahead of schedule.告诉我们,你们是怎样提前完成这一艰巨任务的。
We have reason to believe that the fighting on the border may develop into a full-blown w ar. (喻)我们有理由相信边境上的冲突可能发展成一场全面战争。
He said that he would come. 他说他要来。
Whether the football game will be played depends on the weather.足球比赛是否举行将视天气而定。
2、从属连词that，whether引导的主语从句。
从属连词that，whether在主语从句中的作用只是引导主语从句，它们在从句中不担任成分，不能省略。
(完整版)主语从句详解+例句
(完整版)主语从句详解+例句主语从句是复合句中的一个重要成分，由一个从句作为主语，起到句子中主语的作用。
本文将详细介绍主语从句的结构和用法，并提供一些例句进行说明。
1. 主语从句的结构主语从句由引导词和一个从句组成，引导词在句子中充当主语的角色。
常见的引导词有：- that- whether/if- who- whom- which- what- whoever- whatever主语从句的结构可以是以下几种形式：- 陈述句形式：[that + 陈述句]- 一般疑问句形式：[whether/if + 陈述句]- 特殊疑问句形式：[疑问词 + 陈述句]2. 主语从句的用法- 主语从句可以替代主句中的名词或名词短语作为主语，使句子更加简洁明了。
例如：- That he is late is unacceptable.（他迟到是不能接受的。
）- What you said surprised me.（你说的话让我很吃惊。
）- 主语从句常用于强调句型中，强调句型的结构为：[It + 系动词 + 主语从句 + 其他成分]。
例如：- It is important that we take action now.（我们现在采取行动是很重要的。
）- It doesn't matter what they think.（他们怎么想并不重要。
）3. 主语从句的例句- That he didn't show up was disappointing.（他没有露面是令人失望的。
）- Whether she will join us is still unknown.（她是否会加入我们还不知道。
）- Who will be the winner is yet to be determined.（谁将会是胜利者还有待确定。
）- It is surprising that they didn't invite him.（他们没有邀请他是令人惊讶的。
什么是主语从句
s 什么是主语从句？主语从句（Subject Clause）是一个从句，用来作为主句中的主语。
主语从句用来说明主句中的动作或状态的主体或发出者。
主语从句通常由连词that引导，但在口语中通常可以省略。
主语从句与主句的关系是主谓关系，它们共同构成一个完整的句子。
下面是主语从句的一些常见用法：1. 陈述事实或真理：主语从句可以用来陈述一个事实或真理，说明主句中的动作或状态所涉及的内容。
- That he is late again is really frustrating.（主语从句陈述事实）- It is important that we take care of our environment.（主语从句陈述真理）2. 表达观点或看法：主语从句可以用来表达某人的观点、看法或意见，说明主句中的动作或状态所涉及的观点或看法。
- Whether we should go on a vacation is a matter of personal preference.（主语从句表达观点）- It is my belief that honesty is the best policy.（主语从句表达看法）3. 提出问题：主语从句可以用来提出一个问题，说明主句中的动作或状态所涉及的问题。
- How we can improve our communication skills is a topic worth discussing.（主语从句提出问题）- Whether she will attend the meeting is still uncertain.（主语从句提出问题）主语从句与主句之间是一种主谓关系，用来说明主句中的动作或状态的主体或发出者。
在使用主语从句时，我们需要注意连词的选择，通常使用that来引导主语从句。
通过练习和阅读，我们可以提高对主语从句的理解和运用能力，使我们的表达更加准确、流畅和自然。
主语从句
13. __A__ matters most in learning English is enough practice.(2007全国卷Ⅱ)
Eg：Howthis happenedis not clear to anyone.（这事怎样发生的，谁也不清楚）
Eg：whyhe did itremains a mystery.（他为什么做那件事依然是一个谜。）
重点1：有时为了考虑句子平衡，it做形式主语,而将主语从句放在句末（尤其是当谓语较短时）。这分三种情况：
类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.
11. __C___ book you borrow must be returned within a week.
A. What B. Which C. Whichever D. That’s
12. __C__ wants to stay in a hotel has to pay their own way. (浙江2008)
It must beproved that…必须指出……
类似的过去分词还有：known; expected; believed; estimated;thought; hoped; noted; discussed; required; decided; suggested,etc.
Eg：It isthoughtthathe is the best player.(大家都认为他是最好的选手。)
主语从句讲解
主语从句讲解主语从句主语从句定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。
主语从句是在复合句中充任主语的从句，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。
1.引导主语从句的关联词有三类：(1)从属连词that，whetherThat they were true sisters was clear from the facial resemblance between them.Whether he’ll come here isn’t clear.(2)连接代词who, whom, whose, what, which, whoever, whatever, whichever，What she did is not yet known.How this happened is not clear to anyone.Whoever comes is welcome.(3)连接副词where，when, how, why2.主语从句是在复合句中充任主语的从句，其功同名词一样。
为了避免头重脚轻，常用it作形式主语,而把真正主语放在句子末尾。
How the book will sell depends on its author.That he is the best student in the class is obvious.= It is obvious that he is the best student in the class.注意：主语从句不可位于句首的五种情况(1) if引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。
例如：It is said that President Jingo will visit our school next week.(3) It happens…, It occurs…结构中的主语从句不可提前。
九种英语主语从句
九种英语主语从句英语中，主语从句是一种非常常见的从句结构。
它可以用作句子的主语，起到引出或说明整个句子的作用。
以下是九种常见的英语主语从句的类型及示例：1. 名词从句（Noun Clauses）：名词从句作为主语，用于引出或说明某个事物或情况的真相、原因、目的等。
示例：- What he said is true.（他说的是对的。
）2. 代词从句（Pronoun Clauses）：代词从句用一个代词作为主语，描述或说明某人或某事。
示例：- It's important that we finish the project on time.（我们按时完成项目非常重要。
）- Whoever wants to join the club can sign up here.（想加入俱乐部的人可以在这里报名。
）3. 形容词从句（Adjective Clauses）：形容词从句用于修饰某个名词，作为主语起到描述或说明的作用。
示例：- What you just said is not relevant.（你刚才说的不相关。
）- Where he was born has always been a mystery.（他出生在哪里一直是个谜。
）4. 副词从句（Adverb Clauses）：副词从句用于描述或说明一个动作或状态的条件、原因、时间、地点等。
示例：- When he arrives, we can start the meeting.（他一到，我们就可以开始会议。
）- If you study hard, you will pass the exam.（如果你努力研究，你会通过考试。
）5. 不定式从句（Infinitive Clauses）：不定式从句用于说明一个动作的目的、结果等。
示例：- To win the game is our ultimate goal.（赢得比赛是我们的终极目标。
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。
主语宾语从句
主语宾语从句一、主语从句由句子担任主语的从句叫主语从句，它是名词性从句之一。
主语从句要用陈述语序，且主语从句后的谓语动词用第三人称单数。
引导主语从句的连接词有：从属连词 that , whether 等；连接代词 who , what , which 等；连接副词 when , where , how , why 等。
主语从句在句首时，必须由连接词引导，不能省略这些连接词。
连接词：(1）从属连词： that , whether 等1. that 引导主语从句时只起引导作用，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、句后都可以。
如： That she left him cut him to the heart .Whether it will please them is not easy to say .2．连接代词： who , what , which . whoever , whatever , whichever 等如： What seems easy to some people seems difficult to others .Which side will win is not clear .连接副词： when , where , how , why 等如： Why he did it remains a mystery . How he became a great scientist is known to us all .位置：主语从句可以前置，也可以后置。
用 it 作形式主语时，须把主语从句放在句末，常用下面几种句型It + be ＋表语（名词、形容词、过去分词)＋主语从句，如：(1) It is a fact ( a shame , a pity , good news ....) that ...It is still uncertain whether he is coming or not .It is certain that she will do well in her exam .It is said that Mr . Green has arrived in Beijing .(2) It ＋不及物动词＋主语从句如： It seemed ( happened , doesn ' t matter , has turned out ) that .It happens that they were absent .It doesn ' t matter whether she will come or not .(3) It ＋及物动词（被动语态°)＋主语从句如： It has been decided that the exhibition will not open onSundays .二、宾语从句1．定义：在复合句中，用作宾语的从句叫做宾语从句。
句子中什么是主语从句
句子中什么是主语从句在语文学习中，熟悉并掌握主语从句的使用是非常重要的。
主语从句是由一个连接词引导的，用来充当句子主语的从句。
这个从句本身是一个完整的句子，可以起到刻画情景、衬托主题的作用。
理解主语从句的用法，将对我们的写作和语言表达有着重要的影响。
一、主语从句的概念主语从句是在一个完整的句子中，作为句子的主语的一个从句。
它由一个引导词引导，这个引导词可以是关系代词，例如“that”、“whether”、“who”、“whom”、“which”等。
主语从句是一个从句，即它本身可以是一个完整的句子，它的作用是充当整个句子的主语。
二、主语从句的用法1.主语从句可以用来更好地表达一个概念或情况。
例如，句子“这是我从未见过的景象”中，主语是“这”，但更生动地描述这个场景，可以使用主语从句的方法如下：“我们从未见过的景象，如今出现在我们的眼前。
”在这个句子中，“我们从未见过的景象”作为句子的主语，对于整个句子具有极佳的表达能力，使人感觉到一种神秘的、未知的感觉。
2.主语从句可以用来解释一些名词或形容词。
例如，”令人惊讶的，他什么都看不到。
“这个句子中，“令人惊讶的”是一个形容词短语，可以使用主语从句来做一个修饰或解释的作用。
例如：“他看不到令人惊讶的事情，因为他的眼睛已经瞎了。
”在这个短语中，“他看不到令人惊讶的事情”作为整个句子的主语，可以更好地表达“令人惊讶”的概念。
3.主语从句可以用来表达一个前提条件。
例如，”如果我不到场，会出现混乱。
“这个句子中，使用了一个条件语句，表达了前提条件。
可以使用主语从句的形式，更加生动地表达出来，如下：“在没有我到场的情况下，混乱很可能会发生。
”这个句子中，“在没有我到场的情况下，混乱很可能会发生”作为句子的主语，表达了前提条件的概念，更加精准地表达了意思。
三、主语从句的例子1.主语从句的例子：“谁能帮我把这本书搬走？”这个句子中，主语是“谁能帮我把这本书搬走？”这是一个由关系代词“谁”引导的主语从句。
主语从句总结归纳
主语从句总结归纳主语从句是复合句中的一种从句类型，它在句子中充当主语的角色。
主语从句的引导词有多种，比如that, whether, wh-疑问词等。
主语从句在句子中起到了连接主语和谓语的作用，使句子更加完整和准确。
以下是对主语从句的总结和归纳。
1、基本结构主语从句的基本结构是：引导词 + 主语 + 谓语，其中引导词可以是that, whether或wh-疑问词。
主语从句可以在句首、句中或句尾出现。
主语从句的谓语动词要与主语从句中的主语保持一致。
2、引导词的选择主语从句的引导词根据具体情况来选择。
当主语从句中的主语是一个具体的人或物时，使用that引导；当主语从句中的主语是一个疑问句时，使用wh-疑问词引导；当主语从句中的主语是一个选择时，使用whether引导。
3、主语从句的位置主语从句可以出现在句首、句中或句尾。
出现在句首时，需要用逗号与主句相隔开；出现在句中时，不需要额外的标点符号；出现在句尾时，需要用一个句号或问号来结束。
4、主语从句的语序主语从句的语序要根据引导词和主语从句的具体内容来确定。
当引导词是that时，主语从句的语序与陈述句相同；当引导词是wh-疑问词时，主语从句的语序要根据问句的语序进行调整；当引导词是whether 时，主语从句的语序也与陈述句相同。
5、主语从句的应用主语从句可以用来引导一些陈述句、疑问句或选择句作为整个句子的主语。
它可以使句子更加准确、清晰和有重点，使句子的表达更加丰富和灵活。
以下是一些主语从句的例子：1）That he is guilty is beyond doubt.（他有罪是毋庸置疑的。
）2）Whether she will come or not remains unknown.（她是否会来还不确定。
）3）What they said is not important. （他们说的不重要。
）总结归纳以上，主语从句在英语句子中起到了非常重要的作用。
主语从句
主语从句主语从句是在主句中作主语的句子。
它由连接词引导，通常位于谓语动词之前。
1.连词：在从句中不充当任何成分，常见的引导主语从句的连词有三个，即that, whether, 和if. That 在主语从句中不作成分，没有实际意义；而whether 和if 虽不作句子成分，但都有“是否”的意义，且if 引导的主语从句一般不位于句首。
Whether we will win depends on ourselves. 我们是否会取胜取决于我们自己。
That he got the first prize excited him much. 他获得一等奖一事使他非常兴奋。
It is doubtful if/whether we can get there on time. 我们能否按时到达那儿还不确定。
2.连接代词：在从句中起名词或连词的作用，常做从句的主语、宾语、表语或定语，有具体意义且不能省略。
常见的连接代词有who, whom, whose, what, which, whoever, whatever, whichever .What we should do with the problem is undecided.我们如何处理这个问题还未作出决定。
（what 引导主语从句，不表疑问意义）I’m wondering whatever you said made her so angry. 我在纳闷你究竟说了什么使她这么生气。
（what 引导宾语从句，表示疑问意义）What worries us most is who let out the secret. 令我们担忧的是谁泄露了秘密。
（what 引导主语从句，who 引导表语从句，表示疑问意义）Do you know whose jacket it is?你知道这是谁的夹克衫吗？（whose 引导宾语从句）3.连接副词：在从句中起副词的作用，常做从句的状语，表示时间、地点、原因、方式等。
(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. 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 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 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 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 our brain 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 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. 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 ______ we did 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
主语从句（Subject Clause）一、概念1. 主语。
主语是句子陈述的对象，说明是谁或什么。
主语可以由名词、代词、形容词、分词、副词、数词、动词不定式（短语）、动名词和从句等来充当。
①My school is not far from my house. （名词做主语）主语②We like our school very much. （代词做主语）③Two add two is four. （数词做主语）④This is an article. (指示代词做主语)⑤Seeing is believing. （动名词做主语）⑥To see is to believe. (动词不定式做主语)⑦What I mean is to work harder. (从句做主语)2. 主语从句。
在句中充当主语的从句叫做主语从句。
①That he will come here on Wednesday is certain.他星期三会来，这是肯定的。
连接代词主语（从句）②Whether he will come here on Wednesday is not certain. 还没肯定他星期三是否会来。
连接副词主语（从句）③Where he comes from is unknown. 他从哪里来还不清楚。
④What’s done is done. 事已成定局。
★主语从句结构：连接代词/副词+句子二、主语从句的连接词⑴用从属连词that和whether引导。
That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的。
That she survived the accident is a miracle. 她在事故中幸免于难简直是奇迹。
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
主语从句
主语从句作句子主语的从句叫主语从句。
主语从句通常由下列词引导：1从属连词that，whether 等；2连接代词what，who，whic h，whatever，w hoever，w hom 等；3 连接副词how，when，where，why 等。
一、从属连词：that，whether等.1、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。
That he w ill w in is c ertain.他肯定会赢。
Whether he’ll c ome here isn’t c lear. 他是否会来这里还不清楚。
2、由that 引导的主语从句有时为了使句子结构平衡, 避免“头重脚轻”, 常用it 作形式主语, 而把从句放在后面。
例：1. That he w ill refuse this piec e of advic e is impossible.____________________________________3、这样就构成了下面一些常用句型:（1）: It is + n. +从句It is a pity/shame that... 遗憾的是……It is a surprise that…令人惊奇的是…（2）: It is + adj. +从句It’s certain that…肯定…It is possible that... 很可能……*（3）: It +不及物动词+从句It happened that... 碰巧……It occurred to me that…我突然想起…*________________(刚好)I came into the office at that time.（4）: It + be +过去分词+从句It is said that... 据说……It is believed that...据信……;人们相信……It is suggested that + (should）do... 建议……It must be admitted that…必须承认……*___________________(据报道)20 people were killed in the accident.*______________________(建议)we should eat more v egetable and do more exercise.另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is nec essary (important, natural, strange, etc.) that … It is suggested (requested, proposed, desired, etc.) that…众所周知（1）It is known to us that二、连接代词who ，what ，which, whatev er, whichev er, whoev er ,whom(Who, whom, which, what可以和ever构成合成词，和what一样引导从句，ev er起到强调作用。
主语从句
主语从句一、定义：在句子中担当主语的是一个从句，这个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。
二、引导词：（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。
That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的。
That you are so indifferent bothers me.你如此冷淡使我很烦恼。
That she survived the accident is a miracle.她在事故中幸免于难简直是奇迹。
That she was chosen made us very happy.她当选了使我们很高兴。
That they should refuse to sign the petition required great courage. 他们拒绝在请愿书上签字这是需要很大勇气的。
（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。
Whether she is coming or not doesn’t matter too much. 她来不来都无关紧要。
Whether they would support us was aproblem. 他们是否会支持我们还是一个问题。
Whether we will go for an outing tomorrow remains unknown.（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).What you need is more practice. 你所需要的是更多的训练。
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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 he is still alive is a wonder. 他还活着，真是奇迹。
That we shall be late is certain. 我们要晚了，这是确定无疑的That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。
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。
How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。
How many people we are to invite is still a question. 邀请多少人还是一个问题。
Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。
5. 关系代词型what引导What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
What’s done is done. 事已成定局。
What he says is not important. 他说的话并不重要。
What I am telling you is mere impressions. 我和你说的都不过是一些印象而已。
What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。
What you need is a good-sized canvas bag. 你需要的是一个比较大的帆布袋。
What I am afraid of is their taking him to Portugal. 我担心的是他们把他带到葡萄牙去。
What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。
二、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引导的主语从句，通常用形式主语代主语从句：It’s a pity that he didn’t come. 很遗憾他没来。
It is important that he should know about this. 他必须知道此事。
It’s vital that we be present. 我们出席是至关重要的It was intended that you be the candidate. 大家的意图是让你当候选人。
It is important that this mission not fail. 这项使命不失败至关重要。
It is essential/indispensable that a meeting be convened this week. 本周开一次会非常重要。
It is appropriate that this tax be abolished. 废除这个税是恰当的。
It’s unfair that so many people should lose their jobs. 竟有这么多人失业这是不公平的。
It’s amazing that she should have said nothing about it. 她竟未谈及此事令人惊讶。
It’s unthinkable that they should deny my request. 他们竟然拒绝我的请求，这是不可思议的。
That they should refuse to sign the petition required great courage. 他们拒绝在请愿书上签字这是需要很大勇气的。
3.有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。
主语从句后的谓语动词一般用单数形式。
常用句型如下：（1）It + be + 名词 + that从句It is a fact that … 事实是…It is an honor that …非常荣幸It is common knowledge that …是常识(2) It + be + 形容词 + that从句It is natural that… 很自然…It is strange that… 奇怪的是…（3）It + be + 动词的过去分词 + that从句It is reported that… 据报道…It has been proved that… 已证实…（4）It + 不及物动词 + that 从句It seems that… 似乎…It happened that… 碰巧…It is not known who he is.It does not matter when he leaves.It is a pity that he can’t attend the party.It’s hard to say how much money is needed.It is known to all that money can’t grow on the tree.Has it been decided where the meeting is to be held?三．注意：1. 但主语从句如果是用连接代词what, whatever, whoever 等引导的，表示的是一个具体的东西或人，这种主语从句不能用引导词it 来替换。
What he said interested me greatly.Whoever is tired may rest.2. 另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that …It is suggested (requested, proposed, desired, etc.) that…3. 如果句中做主语的是一个从句，则谓语动词要用单数形式。
How close parents are to their children has a strong influences on the character of the children.How and why he did the experiment is unknown to all.4. If 不可以用来引导主语从句，要用whetherWhether he will write he book is not yet decided.It is not yet decided whether/if he will write the book.4. It 作形式主语和it引导强调句的比较It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。
而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。
被强调部分指人是也可用who/whom。
例如：It is a pity that you didn’t go to see the film.It doesn’t interest me whether you succeed or not.It is in the morning that the murder took place.It is John that broke the window.5. 主语从句不可位于句首的五种情况(1) if 引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。
例如：It is said that President Jingo will visit our school next week. (right)That President Jiang will visit our school next week is said. (wrong)(3) It happens…, It occurs… 结构中的主语从句不可提前。
例如：It occurred to him that he failed in the examination. (right)That he failed in the examination occurred to him. (wrong)(4) It doesn’t matter how/whether …结构中的主语从句不可提前。