公开课主语从句讲解练习及答案(可编辑修改word版)
(完整版)主语从句专项练习(含答案)(可编辑修改word版)
主语从句专项练习(含答案)1.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.W hen 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.I t 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..Is true that the famous scientist will give us a lecture next week.A. thatB. itC. isD. he19.. team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How20.. leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD. Who21.he really means is he disagrees with us.A. What, whatB. What, thatC. That, thatD. That, what22.It has not been decided they will leave for Beijing.A.whenB. thatC. whatD. why23.he will go to work in a mountain village surprises all of us.A.WhatB. ThatC. WhetherD. If24.you don’t like him is none of my business.A.WhatB. ThatC. WhoD. How25.all the inventions have in common is they have succeeded.A.What; whatB. That; thatC. what; thatD. That ; what26.appeared to me that he enjoyed the food very much.A.WhatB. ItC. All thatD. That27.It is widely that smoking can cause cancer.A.believedB. thinkC. sayD. hoped28.caused the accident is still a complete mystery.A.WhatB. ThatC. HowD. Where29.he does has nothing to do with me.A.whateverB. No matter whatC. ThatD. If30.It was he said disappointed me.A.what ;thatB.that; thatC.what;whatD.that;what用正确的代词或介词填空he will come to attend the meeting won’t make any difference.I couldn’t understand was why he didn’t attend the meeting.we will hold the meeting hasn’t been decided yet.leaves the room last ought to turn off the light.suddenly occurred to me that I had left my keys at home.[参考答案] 1-10 CBACD DDCAA 11-20 CBDAC BDBAC 21-30 BABBCBAA。
主语从句超全讲解加练习
1〕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。
That he will win is certain.他肯定会赢。
Whether he’ll come here isn’t clear. 他是否会来这里还不清楚。
注意: 由that 引导的主语从句有时为了使句子结构平衡, 防止“头重脚轻”, 常用it 作形式主语, 而把从句放在后面。
例如:1. That he will refuse this piece of advice is impossible.2.That they should like each other is natural.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…It is a fact that… …是事实It is common knowledge that… …是常识______________(很遗憾)we lost the match._____________(这是事实)he cheated in the exam.2) It is + adj. +从句It’s certain that… 肯定…It is possible that... 很可能……It is unlikely that... 不可能……It is obvious that… 很明显…It is necessary \important \natural\... that…+(should) do________________(很可能)she will come back tomorrow.*_________________(很明显)this measure is effective.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.*____________________(我突然想起)I forget to sent the letter.4) 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..人们相信/认为……It is suggested that + (should〕do... 建议……__________________(据报道)20 people were killed in the accident.*_______________(建议)we should eat more vegetable and do more exercise.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。
主语从句超全讲解加练习
主语从句的规律 ：
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.
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主语从句的规律 ： 例5. When he will come are a puzzle. 正：When he will come is a puzzle.
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3连接副词when,where, how, why等.
Why they suddenly disappeared still remains a mystery. When they will leave is not decided. Where she is from is unknown. How we will paint the house has not been decided.
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.
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主语从句的规律 ：
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.
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注意: 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. 例如:
1. That he will refuse this piece of advice is impossible. __I_t _is__im__p_o_s_s_i_b_le__th_a_t_h__e_w_i_ll_r_e_f_u_s_e_t_h_i_s_p_i_e_c_e __o_f_a_d_v_i_c_e_._____________________________
主语从句超全讲解加练习
误:ＩfMaryrｅａllyｈｅaｒdhimis reallyｄoubｔｆul.
正: Wｈｅｔｈer Marｙrｅaｌlyheａrdhｉｍｉsｒｅａlly dｏubtful.
Cｏmpｌeｔetheｓｅntｅnｃｅs usｉng whａt, wheｔhｅr,ｗｈere,wheｎ, whｏ,ｗｈｙ, hｏwｏr tｈａt.
Wｈｅnｔhey wｉlllｅａvｅiｓ ｎoｔｄecided.
Howwewillpaint thehousｅhasnｏｔbeｅｎdecｉdeｄ.
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 isｎatｕrａl.
正：Ｔhａt thｅyshｏuld like each othｅrｉsnａtuｒal
(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。它们在句子中担任主干成分，并用陈述句形式)
What mａnｙ ｓcｉentiｓｔsｂｅlieve istｈaｔtｈe eartｈiｓrｏunｄ…
Whoｗｉｌl taｋｅpaｒｔin theｍeeting haｓｎoｔbｅen deｃidｅｄ.
Ｉt iｓobｖiｏus thａｔ…很明显…
Iｔ ｉs necｅssary＼ｉｍｐｏrtaｎｔ\natuｒaｌ\..．tｈat…+(sｈｏulｄ)do
_＿__＿_＿_＿__＿＿__＿（很可能）shｅwillcｏme bacｋtomorrow.
*＿__＿＿_＿__＿_____＿＿(很明显)ｔhiｓmeａsurｅiｓeffectiｖｅ.
(完整word版)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。
(完整版)主语从句练习及答案
1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. 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. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he failed in the race.A. WhatB. ThatC. HeD. It16. _____ 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 remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience in international commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。
(完整版)主语从句专项练习(含答案)
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主语从句专项练习(含答案）1.________ makes mistakes must correct them。
A。
What B。
That C。
Whoever D. 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 known D。
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。
高考语法 名词性从句之主语从句与表语从句 讲解及练习(附答案)
名词性从句1 主语从句：在复合句中充当主语成分的句⼦子叫主语从句 1.1 主语从句的引导词 1.2 主语从句的形式Conlusion 1:主语从句作主语时，谓语动词一般用单数（第三人称）形式。
Conlusion 2:连词That在句中无实际意义，不能省略。
Conlusion 3:whether引导的主语从句可放在句首，但if不能。
Conlusion 4:主语从句中连词that/whether等不能重复使用。
Conlusion 5:what引导的主语从句，可根据表语决定主句的单复数形式。
Conlusion 6:为了平衡句子结构，主语从句大多可改写为it形式主语形式。
从属连词连接副词连接代词引导词that,whether,if when, why, where, how, whenever, wherever, however what, who, whom, which, whatever,whoever, whomever, whichever形式说明⽰示例that 引导的主语从句置于句⾸首、that 在主语从句中不做任何成分、不可省略他要来看望我们，这使我们很⾼高兴。
形式评语it代替主语从句It + is/was + adj. +从句对于学⽣生来说很明显的是，他们要为未来做好准备。
“It is/was + necessary/important/surprising/strange/unbelievable/obvious…+从句”结构中，从句谓语动词用“should+动词原形”，should可以省略It + is/was + 名词 +从句我们的希望是，我们都能通过考试。
It + is/was + V-ed +从句据宣布，该计划已经顺利通过。
“It is/was + suggested/advised/ordered/insisted/required/demanded…+从句”结构中，从句谓语动词用“should+动词原形”，should可以省略It + is/was + 特殊动词 +从句(happen,occur,seem,appear…)你似乎不同意这个计划。
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, why1. 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。
公开课主语从句讲解练习及答案(可编辑修改word版)
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。
主语从句超全讲解加练习
When they will leave is not decided. Where she is from is unknown. How we will paint the house has not been decided.
主语从句的规律： 找出下列句子中的错误，并总结规律 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。
主语从句的规律：
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.
3) It +不及物动词+从句 It happened that... 碰巧…… It occurred to me that…我突然想起…
It happened that 刚好)I came into the office *________________( at that time.
*___________________( It occurred to me that 我突然想起)I forget to sent the letter.
Discovery
1.That That we shall be late is certain. 2.Whether Whether they will sell the house is not yet decided.
(完整版)主语从句练习及答案
1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. 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. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he failed in the race.A. WhatB. ThatC. HeD. It16. _____ 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 remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience in international commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。
(完整版)1主语从句练习及答案
主语从句练习1. _____ as much as one-fifth of all timber harvested is not used.A. The estimateB. The estimateC. They are estimatedD. It is estimated that2. _____ was once regarded as impossible has now become a reality.A. ThatB. WhichC. WhoD. What3. _____ we have achieved is attributed to the guidance of our parents.A. WhoeverB. WhateverC. HoweverD. That4. _____ you say now can’t make up for what you’ve done.A. No matterB. WhateverC. HoweverD. That5. Although _____ happened in this developed country sounds like science fiction, itcould 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 wasgetting dark.A. thatB. whichC. itD. what9. _____ occurred to him that he had forgotten to lock the door when he left home.A. ThisB. ItC. ThatD. These10. _____ or not is still uncertain.A. He’s comingB. If he is comingC. That comingD. Whether he’s coming11. It’s _____ he’ll be able to come.A. doubt whetherB. doubtfulC. doubt itD. doubtful whether12. It is _____ that the bridge has existed for more than three centuries .A. appearedB. risenC. saidD. born13. _____ he saw both surprised and frightened him.A. ThatB. WhenC. WhatD. Which14. _____ is a spell of warm sunshine.A. What do we all need.B. What all we needC. What we needD. What we all need15. _____ is a pity that he should feel so upset.A. WhatB. ThatC. HeD. It16. _____ 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 remarkable17. _____ you nominate will be elected.A. WhoB. WhichC. WhomeverD. That’s18. _____ book you borrow must be returned within a week.A. WhatB. WhichC. WhicheverD. That’s19. _____ is troubling me is that I don’t have much experience in international commerce.A. ItB. ThatC. WhichD. What20. _____they wil go there to try another experiment has not been decided yet.A. WhetherB. IfC. About whetherD. Why根据提示，完成句子。
主语从句超全讲解加练习
主语从句的规律：
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。
5.
B was to return to school.
A.That really interested him B.What really interested him C.Which really interested him D.That interest him really 6. C makes mistakes must correct them. A.What B.That C.Whoever D.Whatever 7. A your men have been on my land without permission. A.It seems that B.There seems to be C.That seems D.It seems for 8.It has always puzzled me B the old man lied a red silk ribbon on the young tree.
C That
D Where
3. It
worried her a bit ___ her hair was turning gray. B. that
D. when
A.whether
C. what
4.What I say and think ___ none of your business. A. is B. are C. has D have
主语从句超全练习试题和答案解析
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。
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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 。
Wlietlier 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扌妾代词 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.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-)主语从句例如(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。
) 例女n：Where we should leave it is a problem.Wlien 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。
这分四种情况:⑴ 对于以连词that引导的主语从句，通常用形式主语it替代主语从句:<a> It is +名词+从句It is a fact that事实是；It is good news that .................. 是好j肖息.；It is aquestion that ......... 是个i可题；It is common knowledge that ........... 是常识It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.<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It seems obvious that we can not go on like this.It is necessary that you (should) master the computer.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 proved that… 必须指出....... 例如：Itis 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.<d> It seems 不及物动词（happened / appears / doesift，t matter / makes no difference / occurred that…主语从句不可提前It makes no difference whether he will attend the meeting or not.It does not matter 讦I missed my train.It happened that I saw him yesterday.(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：Whether they would support us was a problem.他们是否会支持我们还是—问题。
It was a problem whether they would support us他们是否会支持我们还是—问题。
(3)对关系代词型what引导的主语从句，通常直接将主语从句放在句首。
如：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。
有时也可将助用形式主语。
如：It is clear enough what he meant,他是什么意思很清楚。
⑷ 如果句子是疑问句，则必须用带形式主语h的结构:Is it true that he is the girl* s father?他是那女孩的父亲，是真的吗？How is it that you are late again?你怎么又迟到了？四、连词that的省略问题引导主语从句的连词that有时可省，有时不能省，其原则是：若that引导的主语从句直接位于句首，则that不能省略；若that引导的主语从句位于句末，而在句首使用了形式主语it,则that可以省略:That you didn' t go to the talk was a pity.很遗憾你没去听报告。
（that 不可省）It was a pity （that） you didn^ t go to the talk,很遗憾你没去听报告。
（that 可A- thinks that B. is thought what C. thought that D- is thought thatthe exp eriment is worth doing.A. ifB. thatC. whetherD. how the boy didn't take medicine made his mother angry<A. That B, What C. How D, WhichA. What, whatB. What, thatC. That, that D, That, what省）主语从句练习题makes mistakes must correct them.A. What B- That C. Whoever D, Whatever2. It worried her a bit her hair was turning grey<A. while B- that C. if D, for3.When and why he came here yet.A- is not known B. are not known C, has not known D. have not known 4. 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 late 5. Tom liked to eat was different fromA. That.. .that you had expectedB. What ….that you had expectedC. That. • .what you had expectedD. Wliat.. .what you had expected 6. we go swimming every day us a lot of good< A< If...do B. That …doC< If...does D< That …does 7JtBob drives badly.8.It's uncertain9. 10-we can't get seems better than we have.11. OU don't like him is none of my business*A. WhatB. WhoC. That D, Whether12.. ____ we'll go camping tomorrow dep ends on the weather.A. If B, Whether C. That D. Where13is going to do the job will be decided by the Party committee. .A. ThatB. WhyC. HowD. Who14we'll finish translating the book dep ends on the time.-A. WhenB. WhyC. WhatD. That15he wont go there is clear to all of us.-A. HowB. WhatC. WhyD. This16the house will be built will be discussed at tomorrow's meeting. .A. IfB. WhereC. ThatD. Whatyou 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. Which B- That C. If D. How20.. leaves the room last ought to turn off the lights.A. AnyoneB. The personC. Whoever D, Who答案：高考题：CBBA 1~5CBACD 6~10DDCAA 11~15CBDAC16-20 BDCAC。