主语从句讲解

主语从句讲解

（一）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.引导主语从句的关联词有三类：

(1)从属连词that ，whether

（1）That they were true sisters was clear from the facial resemblance between them.

（2）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, why

2.主语从句是在复合句中充当主语的从句，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。

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 w hether 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?

3主语从句用陈述语序。关联词位于句首不能省略。

How he became a great scientist is known to us all.

Who the watch belongs to is unknown.

That he finished writing the composition in such a short time surprised us all.

4 主语从句中注意的事项：

1）. 在主语从句中，谓语动词一般用单数。

Whatever he says is of no importance.

Whoever says this is wrong.

但谓语动词用单数还是复数，不可一概而论，而要视句子的意义而定

What I need is money.

What I need are books.

2）. 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 则不然。

What you said yesterday is right.

That she is still alive is a consolation.

3）. 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。

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.

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。

It is still a mystery what caused the accident.

It is a mystery that his death remained.

4）. whether与if

. wwhether引导主语从句时, 常置于句首(此时whether不能用if代替), 也有后移的用法(此时whether可以用if代替)

Whether they will come is not yet known.

It is not yet known whether / if they will go there.

whether和if的区别还有：

1. 引导表语从句用whether

The question is whether you should accept it.

2. whether可以引导从句作介词的宾语

I’m not interested in whether they’ll go or not.

It depends on whether we have got enough money.

3. whether可以直接跟动词不定式连用

I didn’t know whether to laugh or to cry.

She hasn’t decided whether to go or not.

5）用it 作形式主语的结构

(1) It is ＋名词＋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＋从句

It is natural that… 很自然It is strange that… 奇怪的是…

(3) It is ＋不及物动词＋从句

It seems that… 似乎… It happened that… 碰巧…

It appears that… 似乎…

(4) It ＋过去分词＋从句

It is reported that… 据报道… It has been proved that… 已证实…

It is said that… 据说…

09天津) It is obvious to the students ______ they should get well prepared for their future.

A. as

B. which

C. whether

D. that

(07 陕西) ___parents say and do has a life-long effect on their children.

A. That

B. Which

C. What

D. As

( 07 福建) It is none of your business ____other people think about you. Believe yourself.

A. how

B. what

C. which

D. when

(07 全国卷II) ____ matters most in learning English is enough practice.

A. What

B. Why

C. Where

D. Which主语从句(Subject Clause)

定义:在复合句中充当主语的句子叫做主语从句.

第一部分：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）That he finished writing the composition in such a short time surprised us all.

（2）Whether we will go for an outing tomorrow remains unknown.

（3）Who will be our monitor hasn't been decided yet.

（4）Whom we must study for is a question of great importance.

（5）What caused the accident remains unknown.

（6）Whatever you did is right.

（7）Whose watch was lost is unknown.

（8）What we need is time.

（9）What we need are good doctors.

小结:

（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三单,但也有例外,如例9

第二部分：为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末

（1）It is certain that he will win the match.

（2）It is true that he has made a very important discovery in chemistry. （3）It is very likely that they will hold a meeting.

（4）It is strange that he should do that.

（5）It is important that we all should attend the meeting.

（6）It is strange that the man should have stuck to his silly ideas.

（7）It is a pity that we won't be able to go to the south to spend our summer vacation.

（8）It is still a mystery what caused the accident.

（9）It is said that he has gone to shanghai.(=He is said to have gone to shanghai)

（10）It is known to all that the gun powder was first invented by the Chinese.

（11）It is suggested that the work should be done with great care.

（12）It seems that he has seen the film.(=He seems to have seen the film) （13）It happened that the two cheats were there. (=The two cheats happened to be there)

小结:

（1)以that 引出的主语从句,常以形式主语it引导. It is +形容词/名词/某些动词ed + that 从句.

（2) 在有些that从句中要用虚拟语气(should+do/should+have done)例句4,5,6,11.

主语从句与宾语从句两者的用法和在句中的作用是不同的，下面从它们的各自用法，介绍：）~

一．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

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.

2. 用it 作形式主语的结构

(1) It is ＋名词＋从句

It is a fact that … 事实是…

It is an honor that …非常荣幸

It is common knowledge t hat …是常识

(2) it is ＋形容词＋从句

It is natural that… 很自然…

It is strange that… 奇怪的是…

(3) it ＋不及物动词＋从句

It seems that… 似乎…

It happened that… 碰巧…

(4) it is＋过去分词＋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 则不然。例如：

What you said yesterday is right.

二：宾语从句的几个特征：1、引导词：

what\which\whose\when\whether\if\where

2语序：宾语从句必须是用陈述语句。

如：I think that you must work harder.

宾语从句的引导词、连接词的区别、否定转移等现象。

(1)表达时间的几个句型：一般用when或者是what time：

What time will the train leave?

由于时刻都是固定的，也可以用一般现在时代替一般将来时：

What time does the train leave?

(2)时间的表达方式：8：19(nineteen past eight),7:57(three to eight)，在时间的中间也可以加上分的单词(minutes)

(3)had better +动词原型。意思是提要求，建议。但是上下级不能用这种方式，因为语气太重：

You had better give up smoking .

(4)sb leave sth +地点

I left my book in my classroom yesterday.

(5)may I have your name(address\age)?一般询问对方的年龄、名字等，不要习惯以前的问法，这样很不礼貌，而是要采访上面的问法。以前的习惯是：how old are you? \what's your name?

(6)修饰名词的代词次序：限-描-大-形---年---颜----籍----物--------类+名词：

this is a bridge.

This is a beautiful bridge

补充：从句的语序永远是陈述句。

名词性从句之主语从句讲解

名词性从句---主语从句 1. What is needed for the space trip is careful preparation. 2. Her wish is that she can lose weight soon. 3. I think that woman can reach every high achievements in many fields of science. 4. We were very excited at the news that our team had won. 引导名词性从句的关联词可分为三类： 一．从属连词：that（无任何词意） whether, if（均表示“是否”表明从句内容的不确定性） as if ,as though（均表示“好像”，“似乎”）以上在从句中均不充当任何成分二．连接代词：what, who, whom, which，whose, whatever, whoever, whichever(作主宾表定) 三．连接副词：when, where, how, why(作状语) I.主语从句 1.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。 2.位置：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。 3.引导主语从句的关联词： (1)从属连词that,whether,if (在从句中不充当成分，仅起连接作用) That Jack won the match yesterday surprised us. Whether he’ll come here isn’t clear. (此处不能用if) (2)连接代词who, whom, whose, what, which, whoever, whatever, whichever(充当主宾表定) What she did is not known. Whoever comes is welcome. (3)连接副词where,when,how,why(在从句中充当状语) How this happened is not clear to anyone. When the meeting will be held is decided by our manager. 4.有时为了避免头重脚轻，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. = It depends on its author how the book will sell. That he is the best student in the class is obvious. = It is obvious that he is the best student in the class. 用it作形式主语的几种常见结构： (1) It is ＋名词＋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＋从句 It is natural that… 很自然It is strange that… 奇怪的是… (3) It is ＋不及物动词＋从句 It seems that… 似乎… It happened that… 碰巧… It ap pears that… 似乎… (4) It ＋过去分词＋从句

高中英语语法：主语从句的考点分析与专项训练

高中英语语法主语从句 第一节主语从句 1．考点解析。 1．主语从句一般分为三类：由what等代词引导的主语从句；由连词that 引导主语从句，多数情况下由it作形式主语，that从句放到句子后面去；由连接代词或连接副词（或whether）引导的主语从句。 What they are after is beauty. It is not your fault that we can’t arrive on time. When they will arrive has not been decided. 2. 由关系代词what引导的主语从句，也可由whatever（“所…的一切”）或 whoever（“一切…的人”）引导。 Whatever he wants is your support. Whoever comes will be welcome. 3. 大多数主语从句都可用it代替，作形式主语，把主语从句放在句尾。要注意it代替主语从句和it引导的强调句的区别。强调句的结构是it is/was….+that…，强调人是可把that 换做who，whom，whose。如强调的是状语时，也只能用that,而不能用when, where, how, why等。 It was in Paris that they fell in love with each other. It is the lady who was my English teacher. It was last semester that he won the first prize. 2. 试题详解。 1．______ he needs is more experience. A. Who B. That C. What D. How 2.It was because of the heavy snow ______ the train was late. A. why B. that C. so D. thus 3．It doesn’t matter ______ he likes or not. A. whether B. what C. when D. that 4______ he has won the Noble Prize has been proved to be true. A. What B. How C. It D. That 5．What he wants _______ to sleep more. A. are B. have been C. is D. were 6．______ we can begin this investigation is still a question. A. When B. Why C. What D. That 7．It is ______ that the highway will be open to traffic nest year. A. report B. reported C. reporting D. by report 8．______ fails to see this will make a big mistake. A. Whatever B. what C. wherever D. Whoever 9．It is a mystery _____ the prisoner escaped. A. why B. how C. what D. that 10．It was last summer _____ he graduated from the college. A. that B. when C. / D. where 3. 实战演练。 1. We didn’t know ______ she didn’t come. A. why B. that C. when D. it 2. It is still doubtful _______ she would play the part.

主语从句超全练习题及答案

主语从句练习题 [即学即用] I. 用适当的词填空，使句子意思完整。 1. ______ he didn’t attend the meeting yesterday wasn’t quite clear. 2. The Foreign Minister said, “It is our hope ______ the two sides will work towards peace.” 3. ______ team will win the match is still unknown. 4. ______ comes to the party will receive a present. 5. ______ Mary has left is still a question. 6. It’s reported ______ three people were killed in the accident and five were hurt badly. 7. ______ he solved the problem successfully interested all of us. 8. We usually think ______ we can’t get seems better than what we have. 9. It is a fact ______ English is being accepted as an international language. 10. ______ is to be sent there to solve the problem hasn’t been decided. II. 下列各句中均有一处错误，请改正。 1. That the old man’s son wanted to know was where the gold had been hidden. 2. It is reported when China has successfully sent Shenzhou VI spaceship into space. 3. If he can finish his task on time is of great importance. 4. Whether the 2008 Olympic Games will be held in Beijing excited the whole nation. 5. After Yang Liwei succeeded in circling the earth, which our astronauts desire to do is walk in space. 6. Whatever leaves the room last ought to turn off the lights. 7. Why they will solve the serious problem today has not been decided. 8. When will win the English competition is still a problem. 9. How our spring sports meet will be held or not this week is not known yet. 10. It’s strange when he should have gone away without telling us. GRAMMAR 主语从句学习指导 [寻规找矩] 请观察下列句子，注意主语从句的用法。 1. That the earth travels round the sun is a well-known fact. 2. It is uncertain whether the artist can do it or not. 3. Who will act the lead in the play has not been decided yet. 4. Where the young man has gone is not known. 5. It is not yet decided when and where the test will be given. [常见错误展示] 下列各句均有一处错误，请改正并分析错误的原因。 1. Light travels faster than sound is common knowledge. 2. If she’s coming or not doesn’t matter much.

主语从句详解及练习-附答案

语法要点剖析 一、名词性从句 主语从句、表语从句、宾语从句、同位语从句，在整个句子中所起的作用，相当于一个名词。因此，这四种从句通称为名词性从句。 引导名词性从句的连接词可分为三类： 连接词：that, whether, if （不充当从句的任何成分） 连接代词：what, whatever, who, whoever, whom, whose, which. 连接副词：when, where, how, why 1. 主语从句 作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if 和连接代词what，who，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. 他要跟我们说什么，还不清楚。 It is known to us how he became a writer. 我们都知道他是如何成为一名 作家的。 Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。 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（2）It + be + 形容词+ that从句 （3）It + be + 动词的过去分词+ that从句（4）It + 不及物动词+ that 从句 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 a pity (a shame, no wonder, etc.) that… It is suggested (requested, proposed, desired, etc.) that… 2. 宾语从句 名词句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。 1. 由连接词that引导的宾语从句 由连接词that引导宾语从句时，that在句中不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时,第二个分句前的that不可省。例如：He has told me that he will go to Shanghai tomorrow.他已经告诉我他明天要去 上海。 We must never think (that) we are good in everything while others are good in nothing. 我们决不能认为自己什么都好，别人什么都不好。

xx考研英语语法复习主语从句

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在句子中起名词作用的句子叫名词性从句。名词性从句的功能相当于名词词组，它在复合句中能担任主语、宾语、表语、同位语等，因此根据它在句中不同的语法功能，名词性从句又可分为主语从句、宾语从句、表语从句和同位语从句。今天我们就来重点讲一下其中的主语从句。 在复合句中充当主语成分的句子叫作主语从句。它的具体表现形式是：引导词引导一个从句作主语；或者it作形式主语+谓语/系表结构+引导词+从句。 【例1】that That Chris Lee won the champion of Super Girl in 2005 arouse wide public concern.李宇春赢得2005年超女冠军这件事引起了社会的广泛关注。 【例2】what What caused the accident remains unknown.是什么引起了这一事故仍然未知。 【例3】where Where my wife and I should choose to continue my further education is a question of great importance.我太太和我应该去哪享受我们的蜜月还没有最后决定。 【例4】which Which university I should choose to continue my further education is a question of great importance.我应该考哪个大学的研究生是个很重要的问题。 【例5】when When and where the test will be given is not yet decided.什么时候在什么地方进行考试还没定下来。 【例6】-ever Whoever gets the job will have a lot of work to do.任何得到这份工作的人都将要有很多工作要做。 【例7】how How we can protect the grain from damp needs to be discussed.我们怎样才能保护粮食不受潮需要讨论。 【例8】whether Whether this is true or not remains a mystery.这是对是错还是个谜。 It句型 有的时候主语从句过长，根据人类短暂记忆规律，主语过长会影响理解和阅读，往往会用it作形式主语，而把真正的主语放在句尾，加以强调，是为it句型。 【例】 It is a pity that we won’t be able to go to the south to spend our summer vacation.我们不能去南方度过我们的暑假很遗憾。 为表示强调，常以形式主语it引导从句。It+谓语+引导词+从句。由于主语从句一般被认为是单数形式，形式主语代表真正的主语，因此要用it。因此形式主语的谓语动词、be动词+表语均为第三人称单数形式或过去式。 英国桂冠诗人约翰·梅斯菲尔德说：“快乐的日子使人睿智。”很多考生可能觉得这句话应该反过来说，但其实复习过一段时间以后，面对着越来越复杂的难题，你就会发现，保持快乐的心态，复习效率自然而然就会提高。

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