主语从句做主语，主句谓语动词的单复数需根据从句表示的单复数意义决定。1．what引导的主语从句做主语 （1）通常情况下，由what引导的主语从句放在句首时，其后的谓语动词，按语法一致的原则用单数。eg:What she said is correct. What caused the accident is not clear. （2）当主句中的表语是复数形式，或what从句的谓语动词及其补足语均为复数形式时，主句的谓语动词应用复数。eg:What he gave me are five English books. What are used as chief building materials today are steel and concrete. （3）当what引导的主语从句是一个由and连接的并列结构时，应根据句意确定其表达的单复数意义，然后决定主句谓语动词的单复数形式。 eg:What he says and acts does not concern me. What he says and acts do not agree. What I say and what I think are no business of yours. 2．由其它词引导的从句做主语时，谓语动词用单数形式。 Whether they will hold a party or not has not been decided. Who is responsible for the accidents is not clear. 3．当同一个主语从句是由两个不同的引导词引导时，因为它表达的还是同一件事，因此，谓语动词一般用单数。 eg:When and where we should hold the meeting has not been decided yet. 4．当主语是由两个由and连接的主语从句组成，通常表示的是两件不同的事情，主句谓语动词需用复数形式。 What you eat and how much you exercise are important factors in a weight loss program. What caused the accident and who was responsible for it remain a mystery to us.
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
主语从句( if除外) 一定义：在复合句中充当主语的句子，叫主语从句；位于句首。 二：读例句，理解句意，思考，分析，总结。 1：连接词that 引导的主语从句： EG:1）That you are so angry bothers me. 你如此生气使我很烦恼。 2）That she survived the accident is a miracle.她在事故中幸免于难简直是奇迹。 3）It was a pity (that) you didn’t go to the talk.很遗憾你没有去听报告。 4）That he has moved to New York is not true.= It is not true that he has moved to New York. 5）That the earth is round is true.= It is true that the earth is round. 总结：在连接词that 引导的主语从句中，that ___含义，在句子___做成分，__省。EX: 1)______ he will succeed is certain. 2) ________ you didn’t go to the park was a pity. 3) ______ you will win the medal seems unlikely. 2: 连接词whether引导的主语从句。 EG: 1）Whether wild life can be well protected is of great importance. 2）Whether Mary really heard him is really doubtful. 3）Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。 4）Whether he will come hasn’t been decided.= It hasn’t been decided whether he will come. 总结：在连接词whether 引导的主语从句中，whether__含义，____做成分，__ 省。EX: 1) ______ she is coming or not doesn’t matter too much. 她来不来都无关紧要。 2) ______ they would support us was a problem. 他们是否会支持我们还是一个问题。 3) _______ to hold the meeting has not been discussed. 3：在连接代词（who,whom,whose,which,what,whoever,whomever,whichever,whatever）引导的主语从句中。 EG: 1）What is needed for the space trip is careful preparation. 2）Who will be sent to carry out the task has been settled. 3）Whom she borrowed money from still puzzled me. 4）Which side will win is not clear. 5）What I want to know is this. 6）Whoever breaks the law will be punished.( _____ 从句) = Anyone who breaks the law will be punished . ( _____ 从句) 比较：Whoever breaks the law , he should be punished. ( _____ 从句) = No matter who breaks the law, he should be punished. ( _____ 从句) 总结：在连接代词引导的主语从句中，连接代词__含义，___成分，做___语、___语、___语，_____ 省。
主语从句 （一）主语从句的标记主语从句通常由连词that和whether (if)、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 (=anyone who) fails to see this will make a big blunder. Whatever(=anything that) she did was reasonable. 无论什么 Anything that she did was reasonable. Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。Whichever(=anything that) you want is yours. 你要哪个哪个就是你的。 What do you need? What you need is a good rest. I don’t know what you need? 4. 连接副词引导 When we arrive doesn’t matter. 什么时候到没有关系。 When do we arrive? How it was done was a mystery. 这是怎样做的是一个谜。 How was it done? How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。 How did this happen? How many people we are to invite is still a question. 邀请多少人还是一个问题。How many people are we to invite? Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。 Where do i spend my summer? 5. 连接代词型what引导 What(=the thing that) we need is money. 我们需要的是钱。What do we need? 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=the thing that he says is not important. 他说的话并不重要。What does he say? 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 1.That he is still alive is a wonder. 2.That we shall be late is certain. 3.That he should have ignored the working class was natural. 4.That she is still alive is a consolation. 5.That she became an artist may have been due to her father's influence. 6.That you are coming to London is the best news I have heard this long time. 7.That she was chosen made a tremendous stir in her village. 8.Whether it will do us harm remains to be seen. 9.Whether they would support us was a problem. 10.Whoever is top from wins the game when two matched players meet. 11.Whichever (of you) comes in first will receive a prize. 12.Whichever you want is yours. 13.When we arrive doesn't matter. 14.How it was done was a mystery. 15.How this happened is not clear to anyone. 16.How many people we are to invite is still a question. 17.Where I spend my summer is no business of yours. 18.What we need is money. 19.What I want to know is this. 20.What's done is done. 21.What he says is not important. 22.What I am telling you is mere impressions. 23.What make the river more beautiful are the lotus plants growing in the water. 24.What you need is a good-sized canvas bag. 25.What I am afraid of is their taking him to Portugal. 26.What struck me was that they have all suffered a lot. 27.It's a pity that he didn't come. 28.It is important that he should know about this. 29.It's vital that we be present. 30.It was intended that you be the candidate. 31.It is important that this mission not fail. 32.It is essential that a meeting be convened this week. 33.It is appropriate that this tax be abolished. 34.It's unfair that so many people should lose their jobs. 35.It's amazing that she should have said nothing about it. 36.It's unthinkable that they should deny my request. 37.That they should refuse to sign the petition required great courage. 38.Whether they would support us was a problem. 39.It was a problem whether they would support us. 40.It remains to be seen whether it will do us harm or good. 41.What we need is money. 42.What I want to know is this.
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
主语从句 一、翻译下列句子 1.That he is still alive is a wonder. 2.That we shall be late is certain. 3.That he should have ignored the working class was natural. 4.That you are coming to London is the best news 5.Whether it will do us harm remains to be seen. 6.Whether they would support us was a problem. 7.Whether they would support us was a problem. 8.When we arrive doesn't matter. 9.When we shall hold our sports meet is not decided. 10.How it was done was a secret 11.How this happened is not clear to anyone. 12.How many people we are to invite is still a question. 13.Where I spend my summer is no business of yours. 14.What we need is money. 15.What I want to know is this. 16.What he says is not important. 17.What make the river more beautiful are the lotus plants growing in the water. 18.What struck me was that they have all suffered a lot. 19.It's a pity that he didn't come. 20.It is important that he should know about this. 21.It's unfair that so many people should lose their jobs. 22.It's amazing that she should have said nothing about it. 23.It's unthinkable that they should deny my request. 24.It seems that you are right. 25.It was clear his words pleased her. 26.It doesn’t matter much where we live. 27.It was a problem whether they would support us. 28.It remains to be seen whether it will do us harm or good. 29.It is said that he’s got married. 30.It is believed that he will win the match. 31.It is reported that Chinese team got 102 golden medals. 32.Whoever pollutes the environment should be punished. 33.Whatever he did was right.
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.
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 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… (4) it ＋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：
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 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 happended 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。
主语从句练习 单项选择题 1._____ as much as one-fifth of all timber harvested is not used. A. The estimate B. The estimate C. They are estimated D. It is estimated that 2._____ was once regarded as impossible has now become a reality. A. That B. Which C. Who D. What 3._____ we have achieved is attributed to the guida nee of our pare nts. A. Whoever B. Whatever C. However D. That 4._____ you say now can ' t make up for what you ' ve^Sone. A. No matter B. Whatever C. However D. That 5.Although ______ happe ned in this developed country sounds like scie nee fiction, it could occur elsewhere in the world. A. which B. what C. how D. it 6._____ she had forgotte n to take her no tebook. A. That occurred to her B. She occurred that C. To her that occurred D. It occurred to her that 7.I am sure that _____ she said is wrong. A. which B. all C. this D. what 8.We lost our way in the forest, and _____ made matters worse was that it was gett ing dark. A. that B. which C. it D. what 9._____ occurred to him that he had forgotte n to lock the door whe n he left home. A. This B. It C. That D. These 10.or not is still un certa in. A. He'soming B. If he is coming C. That coming D. Whether he' coming 11.It ' _ he' be able to come. A. doubt whether B. doubtful C. doubt it D. doubtful whether 12.It is ____ that the bridge has existed for more tha n three cen turies . A. appeared B. rise n C. said D. born 13._____ he saw both surprised and frighte ned him. A. That B. When C. What D. Which 14._____ is a spell of warm sunshine. A. What do we all need. B. What all we n eed C. What we n eed D. What we all need 15._____ is a pity that he should feel so upset. A. What B. That C. He D. It 16._____ a spo onful of soil can tell us so much about the structure and early history of the moon. A. Remarkable B. Quite remarkably
1. _____ as much as one-fifth of all timber harvested is not used. A. The estimate B. The estimate C. They are estimated D. It is estimated that 2. _____ was once regarded as impossible has now become a reality. A. That B. Which C. Who D. What 3. _____ we have achieved is attributed to the guidance of our parents. A. Whoever B. Whatever C. However D. That 4. _____ you say now can’t make up for what you’ve done. A. No matter B. Whatever C. However D. That 5. Although _____ happened in this developed country sounds like science fiction, it could occur elsewhere in the world. A. which B. what C. how D. it 6. _____ she had forgotten to take her notebook. A. That occurred to her B. She occurred that C. To her that occurred D. It occurred to her that 7. I am sure that _____ she said is wrong. A. which B. all C. this D. what 8. We lost our way in the forest, and _____ made matters worse was that it was getting dark. A. that B. which C. it D. what 9. _____ occurred to him that he had forgotten to lock the door when he left home. A. This B. It C. That D. These 10. _____ or not is still uncertain. A. He’s coming B. If he is coming C. That coming D. Whether he’s coming 11. It’s _____ he’ll be able to come. A. doubt whether B. doubtful C. doubt it D. doubtful whether 12. It is _____ that the bridge has existed for more than three centuries . A. appeared B. risen C. said D. born 13. _____ he saw both surprised and frightened him. A. That B. When C. What D. Which 14. _____ is a spell of warm sunshine. A. What do we all need. B. What all we need C. What we need D. What we all need 15. _____ is a pity that he should feel so upset. A. What B. That C. He D. It 16. _____ a spoonful of soil can tell us so much about the structure and early history of the moon. A. Remarkable B. Quite remarkably C. It is remarkable that D. It is remarkable 17. _____ you nominate will be elected.