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主语从句1．定义：用作主语的从句叫做主语从句。
2．引导主语从句的关联词有三类：(1)从属连词that、whether。
如：如：That they were in truth sisters was clear from the facial resemblance between them.很明显，她们确是亲姐妹，她们的脸型很相似。
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
从属连词：that，whether等.that 引导主语从句只起引导作用，本身无实际意义，在主语从句中不充当任何成分，但不能省略。
由whether及其他连词引导的主语从句放在句首，句后都可。
If只能放在句中。
(2) （特殊疑问词）连接代词who, whom, whose, what, which, whoever, whatever, whichever如：___which_______watch was lost is unknown._____what_____she did is not yet known. 她干了什么尚不清楚。
__which________side will win is not clear.Whoever comes is welcome. 不论谁来都欢迎。
(3) （特殊疑问词）连接副词where, when, how, why，wherever，whenever，however。
___________ he did it remains a mystery.When they will start is not known yet.How this happened is not clear to anyone. 这事怎样发生的，谁也不清楚Wherever you are is my home ---- my only home.你所在的任何地方就是我的家----我唯一的家。
2023年高中英语语法精讲之主语从句详细讲解主语从句结构及用法在句子中担当主语的从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
通常结构为“引导词 + 主语 + 谓语 + 其他成分"。
一. 概念：在句子中担当主语的从句就叫做主语从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
主语从句使用陈述语序，其通常结构为“引导词 + 主语 + 谓语+ 其他成分", 但当连接代词同时充当从句主语时，其结构为“连接代词 + 谓语 + 其他成分”。
二. 引导词：1. that引导eg. That you are coming to London is the best news I have heard this long time.2. whether引导eg. Whether they would come to conference was a question.3. 连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatevereg. Whoever is top from wins the game when two matched players meet.4. 连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhileeg. How this happended is not clear to anyone.5. 关系代词型what引导三. 形式主语it:1. 对关系代词型what引导的主语从句，可以使用形式主语。
eg. It is clear enough what he meant.2. 如果句子是疑问句，则必须用带形式主语it的结构.eg. Is it true that all of us need to to conference?主语从句有哪几类如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。
主语从句一、概念：在复合句中起主语作用的从句叫主语从句。
（一）连接词从属连词：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；例：What he said is true.That you don’t like him is none of my business.Whether the football game will be played depends on the weather.主语从句的时态：不受主句的时态影响和限制。
（1）______ he finished writing the composition in such a short time ______(惊讶) us all.（2）______we will go for an outing tomorrow ______（remains，remained）unknown.（3）______ will be our monitor ______(be) decided yet.（4）______we must study for ______ (be) a question of great importance.（5）______ caused the accident ______（remains，remained）unknown.（6）______ you did ______ (be)right.（7）______ watch ______(be) lost is unknown.（8）______we need ______(be) time.（9）______ we need ______(be) good doctors.小结:（1)主语从句的时态：不受主句的时态影响和限制。
主语从句一、主语从句的连词分三类（1）从属连词引导的主语从句（that whether if）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 引导主语从句通常用it 作形式主语。
That she survived the accident is a miracle.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不能在开头，只能用whether。
Whether she is coming or not doesn’t matter too much.（2）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Whatever we do is to serve the people.注：whatever / whoever的功用whatever = anything that; whoever = anyone who。
要注意和whatever, whoever 引导的让步状语从句的区别。
如：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. ）（3）用连接副词when, where, why, how引导的名词性从句(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、it 作形式主语的主语从句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。
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。
高中主语从句练习题及讲解答案# 高中主语从句练习题及讲解答案## 练习题1. 题目一：尽管他很年轻，但他已经是一位成功的企业家了。
- 例句：_________ he is very young, he has already becomea successful entrepreneur.2. 题目二：无论你什么时候来，我都会在这里等你。
- 例句：_________ you come, I will be here waiting for you.3. 题目三：他相信他能通过这次考试，这让他的父母感到非常高兴。
- 例句：He believes that he can pass the exam, which makes his parents very happy.4. 题目四：我们不知道他是否已经完成了作业。
- 例句：We don't know _________ he has finished his homework or not.5. 题目五：她害怕黑暗，这是众所周知的。
- 例句：She is afraid of the dark, which is _________.## 讲解主语从句是作为动词或介词的宾语的从句，它通常位于句首。
主语从句可以由连接词that, if, whether等引导。
- that引导的主语从句：用来陈述一个事实，通常可以省略。
- if/whether引导的主语从句：用来表达“是否”，通常不能省略。
## 答案1. 答案一： Although/Though _________ he is very young, hehas already become a successful entrepreneur.- 讲解：这里使用了“Although”或“Though”来引导让步状语从句，表示尽管他年轻，但他已经成功。
2. 答案二： Whenever _________ you come, I will be herewaiting for you.- 讲解：“Whenever”引导主语从句，表示无论何时你来。
主语从句复合句中作主语的从句叫主语从句。
引导主语从句的词有连词、连接代词、连接副词。
从属连词：that，whether。
连接代词：who,whom,whose,which,whoever,what,whatever,whichever。
连接副词：where,how,why,when。
一、连接词的选用1. 由what和that引导的主语从句what和that都可引导主语从句。
what除起连接作用外,还在主语从句中充当某些成分(主语、宾语或表语)。
而that在主语从句中不充当任何成分,只起连接词的作用。
例如: What he wants is a new bicycle.2. 由whether引导的主语从句含有"是否"意思的主语从句,连接词不能用if,只能用whether。
例如:Whether we will hold a party in the open air next week is uncertain.3. 由其他连接代词和连接副词引导的主语从句who, which, when, where, why, how等连接代词和连接副词既有疑问含义,又起连接作用,同时在从句中充当各种成分。
例如:Who she is doesn’t concern me.Where I spend my summer holiday is no business of yours.Which car you will choose to buy makes no difference.4. whatever / whoever的用法（~ever=no matter ~---让步状语从句中）whatever / whoever可以引导主语从句,并在句中作主语、宾语、表语等,不含疑问意义。
whatever相当于anything that; whoever 相当于anyone who。
例如:Whoever(Anyone who) wants to enter into this school must take the exam.Whatever(Anything that) she did was right.Whoever（No matter who）wants to enter into this school, he must take the exam.二、形式主语it构成的主语从句1. 由连词that引导的主语从句,在大多数情况下可以用形式主语it代替,即将it放在句首,而将主语从句放在句末,以避免句子头重脚轻。
高考英语主语从句定义：用作主语的从句叫主语从句，它是名词性从句之一。
主语从句的时态：不受主句的时态影响和限制。
引导主语从句的连接词有：从属连词: that, whether；连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)；连接副词: when, where, how和why。
连接词：1. 从属连词：that，whether1）that引导主语从句只起引导作用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略。
2）whether意为“是否”，放在句首句末皆可。
由whether引导的名词从句做主语，表语，介词宾语，同位语时！不可用if代替。
a.That price will go up is certain.b. Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2. 连接代词who ，what ，which, whatever, whichever, whoever (Who, whom, which, what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。
此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序，既有疑问含义,又起连接作用,同时在从句中充当各种成分。
Which side will win is not clear. Whoever breaks the law will be punished.Whatever he did is right. Who killed the scientist remains a question.1）What和that引导的主语从句的区别：that 只起引导作用，不充当任何成分，没有意思。
What 不仅起引导作用，还要充当一定成分(主语、宾语或表语)，意思是：“什么”。
What we need is money. That he will come is certain.2）whatever / whoever的用法（~ever=no matter ~---让步状语从句中）whatever / whoever可以引导主语从句,并在句中作主语、宾语、表语等,不含疑问意义。
whatever相当于anything that; whoever 相当于anyone who。
例如:Whoever(Anyone who) wants to enter into this school must take the exam.Whatever(Anything that) she did was right.3. 连接副词when，where，how，why等。
既有疑问含义,又起连接作用,同时在从句中充当各种成分。
How this happened is not clear to anyone. When he will be back depends on the weather. When we’ll start tomorrow will be told soon. Where the test will be given is not yet decided.4. 主语从句后置：为了避免主语冗长,句子头重脚轻,经常用it 作形式主语,主语从句放在后面作真正的主语. 例: That we shall be late is certain. -- It’s certain that we shall be late.1）用it 作形式主语的结构A. It + be + 形容词+ that 从句(obvious, true, surprising, good, wonderful, funny, possible, likely, certain, probable, etc.) 如：It is certain that she will do well in her exam.B. It + be + 名词词组+ that 从句(an honour, a fact, a pity, etc）如：It is a pity/shame that... 遗憾的是…… It is a surprise that…令人惊奇的是…It is a fact that… …是事实It is common knowledge that… …是常识It’s a pity that we can’t go.C. It + be + 过去分词+ that 从句(said, reported, thought, expected, decided, announced, etc。
）如：It is said that Mr. Green has arrived in Beijing.D. It + 不及物动词或短语+ that 从句( seem，happen, doesn’t matter ,turn out）。
如：It happened that I was out that day. It doesn’t matter whether she will come or not.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：a. Whether they would support us was a problem.b. It was a problem whether they would support us.3）主语从句中的否定前移当用it作形式主语,而将主语从句放在句尾时,主语从句中的否定词常要前移至主句中。
例如: It doesn’t seem that they are from the same university.It doesn’t appear that we’ll have a sunny day tomorrow.5. 注意：1）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。
误：They should like each other is natural. 正：That they should like each other is natural.2）在It + be + suggested/advised/ordered/requested/ insisted/required 中, that从句的谓语也应该用“should + 动词原形”的形式, should有时可以省略。
主语从句中用陈述语序,后面的谓语动词用第三人称单数. It is suggested that we (should) do the experiment a second time.3) . 用于It is important / natural / necessary / impossible that...句型中, 主语从句应使用虚拟语气, 用“should + 动词原形”的形式, should有时可以省略。
It is important and necessary that we (should) keep the balance of nature.4）“what”引导主语从句时，谓语动词：常与其后的名词作表语一致，且根据句子的语境而定。
eg：What you left are only several old books. What you said is of great importance.5）在It is funny, strange, surprising, a pity, a shame, no wonder, etc. + that从句中，有时谓语部分用should + 动词原形，来表达说话者的感情色彩，此时should也可省略。
6）语气"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.It is surprising that Mary should have won first 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.【强调】6..主语从句的规律：例1.When will he come is not known. 正：When he will come is not known.规律一、主语从句一律用陈述语序，即主语在前，谓语在后。
例2. He will not come to the meeting this evening is true.正：That he will not come to the meeting this evening is true.规律二、连词that 在从句中无实际意义，但不能省略。
例3. If the meeting will be put off has not been decided yet.正：Whether the meeting will be put off has not been decided yet.规律三、whether 可以引导主语从句，放在句首，但if不能例4. That whether he will help others is a fact.正：That he will help others is a fact.规律四、主语从句中的连词不能重叠使用。
例5. When he will come are a puzzle. 正：When he will come is a puzzle.规律五、含主语从句的主句谓语动词多用单数第三人称形式。
1. What he needs is that book.2. What he needs are some books.规律六、what 引导的主语从句，可根据表语决定主句动词的单复数形式。
规律七、主语从句为了避免头重脚轻现象，用it 做形式主语，而把从句放在后面。
That the earth turns around the sun is known to all.It is known to all that the earth turns around the sun.1.what / that a.____ he said at the meeting surprised us. b._____ he turned up at the meeting surprised us.2. if / whether _______you go or stay at home won’t make any differences.3.What a pity _____is _____you didn’t arrive by daylight.A. there, becauseB. it, thatC. he, whenD. that, for4.no matter how/who/what/where/whenWe are ready to do ______ the country wants us to do.A. whatB. whichC. no matter whatD. whatever5.It is a pity that you (should) miss such a good chance.___ he made an important speech at the meeting was true.A. ThatB. WhyC. WhatD. How6. ___we’ll go camping tomorrow depends on the weather .A IfB WhetherC ThatD Where7.___ is known to us all is that America is a developed country .A WhichB AsC WhatD It8. It’s known to us all ___ a form of energy .A. water isB. that water isC. is waterD. that water to9. It worried her a bit ___ her hair was turning gray.A. whetherB. thatC. whatD. when10.What I say and think ___ none of your business.A. isB. areC. has D have11. ____ his dream of going to college will come true is uncertain.That B. Whether C. If D. Even if12. It is known to us ___ where there is pollution, there is harm.A. whichB. whereC. whatD. that13. --- I saw your neighbor break your window with a basketball.--- ____ it made me nearly mad.A. That he brokeB. What he brokeC. He brokeD. His break14.It remains a question ____ we can get so much money in such a short time.A.howB. thatC. whenD. what15. He made a promise ___ anyone set him free he would make him very rich.A. thatB. ifC. whatD. that if16. They lost their way in the forest and ____ made matters worse was ___ night began to fall.A. what; thatB. it; thatC. what; whenD. which; what17. ________that they found an unusual plant in the forest.A. It is saidB. They are saidC. It saidD. It says18. _____ caused the accident is still a complete mystery.A. WhatB. ThatC. HowD. Where19. It worried Mary a lot _____ she would pass the college entrance examination.A. whetherB. ifC. thatD. how20. ____ is no possibility ______ Bob will win the first prize in the match.A. There, thatB. It, thatC. There, whetherD. It, whether21. ____surprised me most was _____such a little girl of seven could play the violin so well.A. That; whatB. What; thatC. That; thatD. What; what22. _____ helped to save the drowning girl is worth praising.A. WhoB. AnyoneC. WhoeverD. The person23. ____ she couldn’t understand was _____ fewer and fewer students showed interest in her lessons.A. What; whyB. That; whyC. What; becauseD. Why; that24. It was ____ he said ___ disappointed me.A. What; thatB. That; thatC. What; whatD. That;what25. ___ is a fact that English is being accepted as an international language.A. ThereB. ThisC. ThatD. It26. ______leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD. Who27.________ makes mistakes must correct them. A. What B. That C. Whoever D. Whatever28. Is this factory you visited the other day?A. thatB. whereC. in whichD. the one29.When and why he came here ________ yet.A. is not knownB. are not knownC. has not knownD. have not known30. ________ 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 late31. ________ 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 expected32.________ we go swimming every day ________ us a lot of good.A. If...doB. That...doC. If...doesD. That...does33.It ________ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that34.It's uncertain ________ the experiment is worth doing.A. ifB. thatC. whetherD. how35.________ the boy didn't take medicine made his mother angry.A. ThatB. WhatC. HowD. Which36.____ we can't get seems better than ____ we have.A. What, whatB. What, thatC. That, thatD. That, what37.____ you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether38..____ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where39._________is going to do the job will be decided by the Party committee.A. ThatB. WhyC. HowD. Who40._______we'll finish translating the book depends on the time.A. When B. Why C. What D. That41.______he won't go there is clear to all of us.A. How B. What C. Why D. This42.______the house will be built will be discussed at tomorrow's meeting.A. IfB. WhereC. ThatD. What43_______you come or not is up to you. A. What B. If C. Why D. Whether44._______team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How45 Is this the factory ___ some foreign friends visited other day?A thatB whereC whichD the one1. what / that2. Whether 3--10 BDA BCBBA 11--20 BDAAD AAAAA 21--30 BCAAD CCACC 31--40 DDDCA ACBDA 41--46 CBDAAB。
