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。
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
主语从句主语从句的定义：在句子中起主语作用的从句叫主语从句，从句在句中充当主语成分。
主语从句的用法：主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，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；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。
例如：What he wants to tell us is not clear.It is known to us how he became a writer.Where the English evening will be held has not yet been announced.That he will succeed is certain.Whether he will go there is not known.What he said is not sure.Where he hid the money is to be found out.Whoever comes is welcome.It’s certain that he will succeed.When they’ll start the project has not been decided yet.主语从句考点纵览三、综合练习1. His success was because of ________ he had been working hard.A. thatB. the fact whichC. the fact thatD. the fact2. “Is Mary from New York City” “I don't know _______.”A. from what city does she come fromB. from what city she comeC. what city does she come fromD. what city she comes from3. ________ makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever4. The reason why I didn't go to Shanghai was ________ a new job.A. because I gotB. because of gettingC. I gotD. that I got5. It worried her a bit ____ her hair was turning grey.A. whileB. thatC. ifD. for6. Henry killed the dog. I'll ask him why ________.A. did he do thatB. he did thatC. he didD. he has done so7. Have you seen Henry lately My boss wants to know ________.A. how he is getting alongB. how is he getting alongC. what he is getting alongD. what is he getting along8. It is generally considered unwise to give a child ____ he or she wants.A. howeverB. whateverC. whicheverD. whenever9. He asked me ________ with me.A. what is the troubleB. what wrong wasC. what was the matterD. what trouble it is10. I am sure ________ he said is true.A. thatB. about thatC. of thatD. that what11. When and why he came here ________ yet.A. is not knownB. are not knownC. has not knownD. have not bee12. I wonder how much ________.A. does the watch costB. did the watch costC. the watch costedD. the watch costs13. Mary is ________ someone might recognize her.A. afraid ofB. afraid aboutC. afraid thatD. afraid for14.________ 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 late15. They came to the conclusion ________ by a computer.A. that not all things can be doneB. because of not all things be doneC. being not all things can be doneD. because not all things can be done16. Why the explosion occurred was ________ the laboratory attendant had been careless.A. forB. becauseC. sinceD. that17. I don't doubt ________ he'll come.A. thatB. ifC. whatD. whether18. —“Why did you go to the wrong class, Mr. Wang”—“Well, I forget _______ I was supposed to go to.”A. which the roomB. which roomC. what was the roomD. what room was it19. Output is now six times ________ it was before liberation.A. thatB. whichC. whatD. of which20. Mary: Helen is a mere washer woman, yet she's now buying a big house.Carol: Yes. Because she's always saved ________.A. what little she earnsB. how little she earnsC. for little she earnsD. with little she earns21. ______ surprised me most was ______ such a little boy of seven could play the violin so well.A. That…whatB. What…thatC. That…whichD. What…which22. We gave him ________ help we could.A. whichB. whatC. thatD. this23. She is pleased with what you have given him and ________ you have told him.A. thatB. whichC. all whatD. all that24. Excuse me would you please tell me ________A. when the sports meet is taken placeB. when is the sports meet going to be heldC. when is the sports meet to beginD. when the sports meet is to take place25. Do you happen to know ________A. what size shoes he wearsB. how big shoes he wearsC. what is the size of his shoesD. what number shoes are his26. This book will show you ________ can be used in other contexts.A. how you have observedB. how what you have observedC. that you have observedD. how that you have observed27. Where do you think ________A. has he goneB. has he beenC. he's goneD. was he28. Do you know ________A. how many populations there are in the worldB. how much population there is in the worldC. how many the population of the world isD. what the population of the world is29. Would you go and see ________ outsideA. what to take placeB. what Tom has happenedC. what is happeningD. what the matter had been30. The subject of "What is interesting is that I do not even know him." is_______.A. whatB. interestingC. What is interestingD. I31. ________ I think he is Charles.A. Who do you think he isB. Do you think who he isC. Whom do you think he isD. Do you think who he is32. He didn't know which room ________.A. they livedB. they lived inC. did they liveD. did they live in33. The little boy ate ________ his mother gave him.A. thatB. whichC. whateverD. no matter what34. The city is no longer ________.A. what it isB. that it used to beC. which it wasD. what it used to be35. My parents used ________ they had to get a new car for me.A. whichB. thatC. whatD. all what36. ________ we go swimming every day ________ us a lot of good.A. If…doB. That…doC. If…doesD. That…does37. ________ was the idea _______ the wife thought ofA. What…thatB. That…whatC. How…whyD. Why…how38. _______ did he tell his wife ________ he wished to doA. That…whatB. What…thatC. Where…whichD. Which…where39. One of the men held the view ________ the book said was right.A. what thatB. that whatC. that whichD. which that40. I have no idea ________ or not he has finished the work.A. ifB. thatC. whetherD. which41. —“Do you know ________”—“His father is a doctor.”A. what is his fatherB. who is his fatherC. what his father isD. who his father is42. Is this ________ we met each other two years agoA. placeB. place in whichC. whereD. place which43. It ________ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that44. We all know the truth ________ there are air, water and sunlight there are living things.A. whereB. whereverC. thatD. that wherever45. They discussed ________ they could settle the problem without others' help.A. ifB. thatC. whatD. whether46. She asked ________.A. what I was doing when she rang me upB. what was I doing when she rang me upC. when she rang me up what I was doingD. when did she ring me up what I was doing47. —May I borrow the ring—You can take _______ you like.A. no matter whatB. whichC. whicheverD. that48. He said that he was fond of ________.A. what beautiful isB. what is beautifulC. beautiful is whatD. what it is beautiful49. He insisted that he ________ in good health and _______ to work there.A. was, be sentB. is, is sentC. be, was sentD. be, send50. Do you know ________ he expects will give us a talkA. whoB. whomC. thatD. whose参考答案1-5.CDCDB 6-10.BABCD 11-15.ADCCA 16-20.DABCA 21-25.BBDDA 26-30.BCDCC 31-35.ABCDC 36-40.DABBC DDD 46-50.ACBAA。
英语从 主语从句语法
英语从主语从句语法主语从句是英语语法中的一个重要概念，它在句子中充当主语的角色，起到引导整个句子的作用。
掌握主语从句的使用方法，对于提高英语语言表达能力和句子结构的多样性有着重要的意义。
本文将详细介绍关于主语从句的语法规则和使用技巧，以帮助读者更好地理解和运用主语从句。
一、主语从句的定义和特点主语从句是一种从句类型，它由一个引导词引导，放在句子的主语位置，起到句子的主语作用。
主语从句可以是一个单词或词组，也可以是一个完整的句子。
主语从句通常由连接词that, whether/if, who, which, when, where, why等引导。
二、主语从句的语法规则1. 引导词that引导的主语从句主语从句中的引导词that常常被省略，特别是在口语和非正式的写作中。
例如：“It is important to study hard.”（努力学习很重要。
）2. 引导词whether/if引导的主语从句引导词whether/if经常用于引导主语从句，表达对某件事情进行选择或疑问。
例如：“Whether we should go hiking tomorrow is still under discussion.”（我们是否应该明天去徒步还在讨论中。
）3. 引导词who, which, what引导的主语从句这些引导词引导的主语从句通常涉及人或事物的具体内容，用来强调或描述主语。
例如：“Who will be the winner of the competition is still unknown.”（谁会成为比赛的获胜者，还是未知的。
）4. 引导词when, where, why引导的主语从句这些引导词通常用来引导时间、地点和原因状语从句，也可以用作主语从句。
例如：“When the concert will take place is yet to be announced.”（音乐会将在何时举行，尚未宣布。
主语从句公开课PPT课件
主语从句可以包含丰富的信息， 包括时间、地点、条件、原因等
，使表达更加准确具体。
通过主语从句可以精确地描述某 个事件或情况，避免歧义和误解
。
主语从句还可以用来表达复杂的 观点和态度，使文章更具深度和
说服力。
增加文采和感染力
主语从句可以采用多种句式和表达方 式，如倒装句、强调句等，增加文章 的文采和感染力。
连接代词和连接副词引导的主语从句一般放在句首，谓语动词用单数形式。
连接代词what和which在引导主语从句时，有时可以互换使用，但which更强调选 择范围。
主语从句时态、语态和语气
03
问题
时态问题
主语从句时态与主句时态一致
01
主语从句中的动词时态通常与主句中的动词时态保持一致，表
示同时发生的动作或状态。
当主语从句中的主语是表示数量的短语（如a number of, the majority of等）时，谓 语动词的单复数形式取决于短语所修饰的名词。
主语从句中的主语是并列结构时，谓语动词用复数形式
当主语从句中的主语是由and连接的并列结构时，谓语动词用复数形式。
练习题讲解
选择题
通过选择题的形式， 让学生判断主语从句 中主谓一致问题的正
当主语从句中的主语是复数形式时，谓语动词必须与主语保持一致，也用复数形式。
特殊情况处理方法
主语从句中的主语是不定代词时，谓语动词用单数形式
当主语从句中的主语是不定代词（如something, nothing, anyone等）时，谓语动词 用单数形式。
主语从句中的主语是表示数量的短语时，谓语动词用单数或…
主语从句与形式主语的区分
形式主语it代替真正的主语从句，使句子结构更加平衡。需注意形 式主语与真正主语的区分。
(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。)
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。
主语从句的分类
主语从句的分类
1. 哇塞，主从里面的那一类，叫陈述句作主语从句呀！就像“他说他喜欢读书”，这里面“他说”后面的“他喜欢读书”就是个陈述句作主语从句呢。
2. 嘿，还有疑问句作主语从句呢！比如说“她想知道谁会来”，“谁会来”这不就是个疑问句作主语从句嘛。
3. 哇哦，你知道不，还有一种叫whether 引导的主语从句！就好像“是否
他会来还不确定”，这里的“是否他会来”就是这类呀。
4. 哎呀呀，that 引导的主语从句也很常见哟！像“那个他很聪明是大家都
知道的”，“那个他很聪明”就是典型的 that 引导的主语从句。
5. 天呐，连接代词引导的主语从句也不可或缺呢！比如说“谁先完成任务谁就有奖励”，“谁先完成任务”就是由连接代词引导的呀。
6. 咦，连接副词引导的主语从句也很有意思呀！像“他为什么迟到我不知道”，“他为什么迟到”就是连接副词引导的咯。
7. 哇，it 作形式主语的主语从句也得说说呢！比如“it 是很重要的他能按时到”，这里面真正的主语就是“他能按时到”呀。
8. 呵，还有一种比较特殊的主语从句呢！像“这么晚了他还在这里很奇怪”，这就是一种特别的表达呢。
9. 总之呢，主语从句的分类还真是多样！我们得好好掌握呀，这样才能在英语运用中更加得心应手呢！。
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
• 从属连词：that， whether等. 从属连词： ， 等 • that 引导主语从句只起引导作用，本身无 引导主语从句只起引导作用， 实际意义，在主语从句中不充当任何成分， 实际意义，在主语从句中不充当任何成分， 但不能省略。 但不能省略。 • 由whether及其他连词引导的主语从句放在 及其他连词引导的主语从句放在 句首，句后都可。 只能放在句中 只能放在句中。 句首，句后都可。 If只能放在句中。
• B. It+be+名词词组(no wonder, an honour, a good thing, a pity, no surprise, etc.)+that从句。 如： • It’s no surprise that our team should have won the game. 我们没赢这场比赛真意外。 • 造句：很遗憾我们不能去。
• C. It+be+过去分词(said, reported, thought, expected, decided, announced, arranged, etc.)+that从句。如： • It is reported that China has sent another man-made earth satellite into orbit. • 据报道中国又成功地发射了一颗人造地球 卫星。 • 造句：据说格林先生已经到了北京。
• 造句： • 1.、很明显他是个好人。
• 2.、他通过了考试让妈妈很高兴。
• 3、天气是否会转晴还不确定。
• (3) （特殊疑问词）连接代词who, whom, whose, what, which, whoever, whatever, whichever 如： __________watch was lost is unknown. __________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。
英语的主语从句
主语从句：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。
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”。
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引导例句：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。
2. whether引导例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导例句：Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
4. 连接副词引导例句：How this happended is not clear to anyone. 这件事怎样发生的，谁也不清楚。
5. 关系代词型what引导例句：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：例句：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) 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：例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
主语从句例句
主语从句例句
1. 主语从句: 他说他会来参加聚会。
2. 主语从句: 她告诉我她已经完成了作业。
3. 主语从句: 老师说我们会有一场考试。
4. 主语从句: 妈妈告诉我弟弟会在晚上回家。
5. 主语从句: 他说他喜欢读书。
6. 主语从句: 我爸爸告诉我他已经买了回家的车票。
7. 主语从句: 奶奶说她准备去旅行。
8. 主语从句: 老板告诉我他会给我加薪。
9. 主语从句: 老师说明天会有一场考试。
10. 主语从句: 他说他已经买了一台新电脑。
以上是10个使用主语从句的例句，可以看到主语从句在句子中充当主语的作用，帮助我们表达具体的动作、想法、计划等。
使用主语从句可以使句子更加丰富和生动。
英语语法句子主语从句
英语语法句子主语从句在句子中起名词作用的各种从句，通称为名词从句。
根据它们在句子中的作用，这类从句分别称为主语从句、表语从句、同位语从句。
主语从句可置句首，也可用it 作形式主语，而将从句置句末，如何学好英语?小编在这里整理了相关资料，快来学习学习吧!英语语法句子主语从句一、主语从句的概念与类型主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what,which, whoever, whatever, whichever和连接副词when, where, why, how等.例如:That she was chosen made us very happy.她当选了使我们很高兴.What caused the accident is a completemystery.是什么导致了这次事故还完全是一个谜.Whether she will come or not is still a question.她是否来还是一个问题.Which team will win the match is stillunknown.哪个队会赢得这场比赛还不知道.Whoever comes to the party will receive apresent.参加聚会的每一个人都将收到一份礼物.When they will start has not been decidedyet.他们何时出发还没决定.注意:上述例句中的主语从句都是放在句首,但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.例如:It is a pity that she has made such amistake.她犯了这样一个错误,真是遗憾.It depends on the climate whether they aregoing shoppingtoday.他们是否今天去购物还得看天气情况.这样就构成了下面一些常用句型:1)It is + adj. / n. +从句It is a pity/shame that...遗憾的是……It is possible that...很可能……It is unlikely that...不可能……2)It +不及物动词+从句It seems/appears that...似乎……It happened that...碰巧……3)It + be +过去分词+从句It is said that...据说……It is known to all that...众所周知……It is reported that...据报道……It is believed that...据信……;人们相信……It is suggested that...有人建议……It must be pointed out that...必须指出……It has been proved that...已证明…….例如:It is believed that at least a score ofbuildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉.It is suggested that the meeting should beput off.有人建议会议延期召开.It's reported that three people were killedin the accident and five were hurt badly.据报道,事故中三人丧生,五人重伤.It is known to all that Taiwan is aninseparable part of China.众所周知,台湾是中国不可分割的一部分.巩固练习1. Does_______ matter if he can't finish the job on time?A. thisB. thatC. heD. it2. It worriedher a bit _______ her hair was turning grey.A. whichB. thatC. ifD. for3. _______ isa fact that English is being accepted as an international language.A. ThereB.ThisC. ThatD. It二、学习主语从句应该注意的几个问题1)引导词that与whatwhat既有引导主语从句的作用,同时又在从句中作句子成分(主语、宾语、表语等).这时what相当于all that/everything that...,常译成"所……的(东西、事情、话等.)";而that只起连接作用,本身无实际意义,在从句中也不担当任何句子成分.但that引导的主语从句放在句首时,不能省略that.例如:What is done can't be undone.(谚语)已成定局,无可挽回.What we can't get seems better than what wehave.我们得不到的东西似乎比已得到的要好. That we should work out a plan to deal with the present serioussituation is important.我们应该制定一项计划来应付目前严峻的形势,这一点非常重要.That a new teacher will come to teach usgeography is true.一位新老师将来教我们地理,这是真的.巩固练习4. _______what they told me really true?A. HasB. IsC. DoesD. Have5. It matterslittle _______ a man dies, but _______ matters much is _______ he lives.A. how; what;howB. how; it; howC. why; it; whyD. that; what; that6. _______ shecouldn't understand was _______ fewer and fewer students showed interest in herlessons.A. What; whyB. That; whatC. What; becauseD. Why; that7. It ispretty well understood _______ controls the flow of carbon dioxide in and outthe atmosphere today.A. thatB. whenC. whatD. how8. _______ fashion differs from country tocountry may reflect the cultural differences from one aspect.A. WhatB. ThatC. ThisD. Which9. -What made her parents so angry? - _______ she had failed in the examination. A. As B. Because C. Since D. That2)引导词if和whetherif和whether引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句(放在句首时)、表语从句常由whether引导.例如:Whether she will go home or not is unknown.她是否回家还不得而知.Whether we shall raise ducks or geeseremains to be decided.我们是养鸭还是养鹅仍没决定.It remains to be decided whether/if we shall raise ducks orgeese.但我们不能说If we shall raiseducks or geese remains to be decided.巩固练习10. _______we'll go camping tomorrow depends on the weather.A. IfB.WhetherC. ThatD. Where3)其它引导词连接代词who, which, whom,whose有各自的意义,起连接作用,并在从句中充当语、宾语、表语、定语等;连接副词when,where, why,how等有各自的意义,起连接作用,并在从句中充当状语.巩固练习11. -Do youremember _______ he came? -Yes, I do. He came by car.A. howB. whenC. thatD. if12. It was amatter of _______ would take the position.A. whoB.whoseC. whomD. whomever13. -I droveto Zhuhai for the air show last week. -Is that _______ you had a few days off? A. why B. when C. what D. where14. I readabout it in some book or other, does it matter _______ it was?A. whereB.whatC. howD. which三、语气在It is necessary / natural/ important / strange...+ that-clause 这类句型里,that所引导的主语从句中谓语动词用"should+原形",表虚似语气.例如:It is necessary that the problem should besettled at once.这个问题必须马上解决.It's strange that he should have gone awaywithout telling us.他竟然没向我们说一声就走了,真是奇怪.巩固练习15. It isnecessary that a college student _______ at least a foreign language.A. mastersB.should masterC. masteredD. will master四、以it作形式主语的主语从句与强调句型的区别"It be + adj./n. + that-clause"与强调句型均有It be...that...之类的语言标志,但不同的是:①前者中的that从句是主语从句.若删掉其中的It be和that,则剩余部分不论结构还是语意都不能成为一个句子;但若将后者中的It be和that去掉,则剩余部分的结构和语意仍能构成一个完整的句子.②强调句型译为汉语时可加上"正是……"或"就是……"之类的字眼,而主语从句则不可以.请比较下面两个句子:It is surprising that Mary should have wonfirst place.令人惊奇的是玛莉竟然获得了第一名. It is Mary that has won first place.正是玛莉得了第一名.第一句话中的It是形式主语,that引导的是主语从句.句中的It is和that无法删除,一旦删除句子就不成立.第二句是强调句型,其中的It is和that可以去掉,因为没有It is和that句子仍然很通顺.主语从句<例句>It's certain that prices will go up.物价肯定要上涨的。
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
常规主语从句，即句子在复合句中充当一个主语主语从句的时态：不受主句的时态影响和限制。
（1)引导主语从句连词有that,whether,who,what,whatever等（2)连词位于句首不能省略（3)主语从句大多数情况下视为第三人称单数,但也有例外（1）为避免头重脚轻,常以形式主语it引导从句. It+形式主语谓语+从句.（2）由于主语从句一般被认为是单数形式，形式主语的谓语动词、be动词+表语均为单数第三人称形式或过去式.主语从句是在复合句中充当主语的从句，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. It 作形式主语和it引导强调句的比较①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如：It is still a question whether she will come or not.It is strange that you should like him.It is still unknown which team will win the match.另外，还有一些比较多见的结构：It turned out that……；It has been proved that……;It happened/occurred that……；It is well-known that……等等②而强调句则不同，它的结构是：It+be+被强调部分+that+从句强调主语：It is the times that produce their heroes.时势造英雄强调宾语：It is English that Prof.Lin teaches us.强调状语：It was in shanghai that I saw the film.判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
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主语从句
概念
主语相当于句子的话题或主题，即要说明的入或物，也可以说是动作的发起者（主动语态中）。
能用来作主语的有名词、代词、动名词、动词不定式、主语从句等。
主语从句，即在复杂句中充当主语成分的句子，主语从句分为常规主语从句和后置主语从句。
例如"That he finished writing the composition in such a short time surprised us all"，他在很短的时间内写完作文让我们都很惊讶，此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此“That he finished writing the composition in such a short time”便是该复合句的主语从句。
连词：连词的选择同总论中所述。
分类：
一、常规主语从句
句子在复合句中充当一个主语
时态：主语从句的时态不受主句时态的影响和限制
人称：主语从句大多数情况下视为第三人称单数
（1）That he finished writing the composition in such a short time surprised us all.
他在如此短的时间内写完作文使我们十分惊讶。
（2）Whether we will go for an outing tomorrow remains unknown.
我们明天是否会去郊游仍旧未知。
（3）Who will be our monitor hasn't been decided yet.
现在还没有决定谁会成为我们的班长。
（4）Whom we must study for is a question of great importance.
“我们为谁而学习”是个很重要的问题。
（5）What caused the accident remains unknown.
事故的起因是未知的。
（6）Whatever you did is right.
你做的任何事都是正确的。
（7）Whom the watch belongs to is unknown.
手表的归属是未知的。
（8）What we need is time.
我们需要的是时间。
（9）What we need are good doctors
注意：主语从句大多数情况下视为第三人称单数，但也有例外，如例（9）
二、后置主语从句
为了防止句子头重脚轻，通常把形式主语it放在句首位置，真正主语搁置于句末，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句。
例句：
（1）It is certain that he will win the match.
他一定会赢得这场比赛的。
（2）It is true that he has made a very important discovery in chemistry.
他的确在化学领域有了一个伟大的发现。
（3）It is very likely that they will hold a meeting.
他们很有可能会举行一场会议。
（4）It is strange that he should do that.
他竟然那样做是很奇怪的。
（5）It is important that we all should attend the meeting.
重要的是我们都应该参加会议。
（6）It is strange that the man should have stuck to his silly ideas.
真奇怪，这个人竟然坚持自己愚蠢的想法。
（7）It is a pity that we won't be able to go to the south to spend our summer vacation.
真遗憾我们不能去南方度过我们的暑假。
（8）It is still a mystery what caused the accident.
造成事故的原因仍旧是个秘密。
（9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai)
据说他已经去上海了。
（10）It is known to all that the gun powder was first invented by the Chinese.
所有人都知道火药最初是由中国人发明的。
（11）It is suggested that the work should be done with great care.
建议工作应该被小心地被完成。
（12）It happened that the two cheats were there. (=The two cheats happened to be there)
两个骗子碰巧在那里。
注意：由于主语从句一般被认为是单数形式，形式主语的谓语动词、be动词+表语均
为单数第三人称形式或过去式。
It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句。
例如：
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外，还有一些比较多见的结构：
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同，它的结构是：It+be+被强调部分+that+从句
强调主语：It is the times that produce their heroes.时势造英雄
强调宾语：It is English that teaches us.
强调状语：It was in shanghai that I saw the film.
判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把be动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
2. 用it 作形式主语的结构
(1) It is +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 is +形容词+that从句
It is natural that…很自然……
It is strange that…奇怪的是……
(3) it +不及物动词+that从句
It seems that…似乎……
It happened that…碰巧……
(4) it is+过去分词+that从句
It is reported that…据报道……
It has been proved that…已证实……
3.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。
例如：
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。
例如：
It doesn’t matter whether he is wrong or not.
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。
例如：
Is it likely that it will rain in the evening
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在从句中充当句子成分，如主语．宾语．表语，而that 则不做任何成分。
例如：
What you said yesterday is right.
That he has gone made me sad. （that位于句首，不做任何成分，但不可省略）。