(完整word版)初中主语从句讲解

1、主语从句名词性从句包括：主语从句、表语从句、宾语从句和同位语从句。引 导名词性从句的连词有：A. 连词： that, whether, if（这三个词都不作从句的成分，同时， that 无含义，而 whether 和 if 都表 “是否 ”）B. 疑问代词： who, whom, whose, what, whichC. 疑问副词： when, where, why, how（一）主语从句：在复合句中充当主语的从句。1. that 引导主语从句 that引导主语从句时不同于其他的连词，既无词义也不作成分，只起 单纯的连接作用， 且通常不可以省。 为了强调 that 引导的主语从句而 置之于句首

2、时， that 不可省。 That the driver could not control his car waso bvious. 很明显司机不 能控制住他的车了 That she was chosen made us very happy. 她被选上让我们很高兴 That he will come is certain. 他要来已经千真万确了通常， that引导主语从句时用 it 做形式主语，把从句置于句尾，此 时 that 有时可省。例如： It was obvious that the driver could not control his car. 很明显司机 不能控制住他 It

3、 made us very happy that she was chosen. 她被选上让我们很高兴 It is certain that he will come. 他要来已经千真万确了 如果以 that 从句为主语的句子是疑问句，就只能用先行词 it 结构。 例如： Is it certain that he will come? Is it true that he would take the risk?it 做形式主语有以下几种不同的结构：(1) It + be + 形容词+ that-从句 It is likely that he will come. 他可能会来 It is s

4、trange that she has ever trusted him. 她相信他，真令人奇怪(2) It + be +名词+ that-从句It is common knowledge that the whale is not a fish. 鲸鱼并不是鱼， 这 是常识It's a pity that he should have catched the train.(3) It + be + -ed 分词 + that 从句It is said that he is a famous writer. 据说他是个著名作家It is reported that there will

5、 be a storm this afternoon. 据报道下午将有 一场暴风在表示建议、要求、命令等意义的被动结构中， that 从句中的谓语 动词常用 (should) do。(参见虚拟语气部分)It is suggested that the meeting (should) be held this afternoon. 会议被建议在下午举行It is demanded that he (should) leave at once. 他被要求立即离开(4) It + seem/happen/appear等不及物动词 + that 从句。It seems that he is wron

6、g. 看起来似乎他错了It appears that they are in need of help. 看起来他们需要帮助2. whether 引导主语从句，意为 “是否 ”，只起连接作用，不充当任何 成分。(置于句首时必须用 whether 引导，置于句尾时，间或可用 if 。) Whether he will win the game is not clear. 他是否会赢得比赛还不清 楚。Whether he will come is uncertain. 他是否会来还不确定It is not clear whether/if he will come.It was uncertain

7、 whether he would come.3. 连词代词 what, who, which, whose 等引导的主语从句。这些连接 代词作用相当于代词，在从句中担当主语、宾语、表语、定语等。What we need is more time. 我们需要的是更多时间Who was responsible for the accident is not yet clear. 谁应该对这场事 故负责还不清楚。Whose book it is not important. 这是谁的书并不重要。Which school you want to go matters much. 你想去哪所学校很重要

8、4. 连接副词 when, where, why, how 引导的主语从句。这些连接副词 相当于副词，在从句中充当状语。Why he did this is not known. 他为什么做这件事还不知道。When he will come is still unknown. 他什么时候来还不知道。It is not known why he did this. 他为什么做这件事还不知道注意： wh-引导的主语从句也常用 it 作形式主语。5. 也可用 whatever,whoever,whomever,whenever,wherever 等词引导 主语从句，表示 “无论什么 ”、“无论谁 ”

9、、“无论何时 ”、“无论在（到） 哪里”等。Whatever he gave you should be handed in. 他无论给你什么都要上交Whoever told you that was lying . 无论谁告诉你，那都是撒谎 Whoever comes is welcome. 无论谁来都是欢迎的参考答案 1-10 CBACD DDCAA11-20 CBDAC BDBAC21-30 BABBCBAA主语从句专项练习1. makes mistakes must correct them.A. What B. That C. Whoever D. Whatever2. It wor

10、ried 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 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 fe

11、w 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.do B. That.doC. If.does D. That.does7.It Bob drives

12、badly.A. thinks that B. is thought what C. thought that D. is thought that8.It's uncertain the experiment is worth doing.A. if B. that C. whether D. how9. the boy didn't take medicine made his mother angry.A. That B. What C. How D. Which10. we can't get seems better than we have.A. What,

13、 what B. What, that C. That, that D. That, what11. you don't like him is none of my business.A. What B. Who C. That D. Whether12. we'll go camping tomorrow depends on the weather.A. If B. Whether C. That D. Where13. is going to do the job will be decided by the Partycommittee.A. That B. Why

14、C. How D. Who14. we'll finish translating the book depends on the time.A. When B. Why C. What D. That15. he won't go there is clear to all of us.A. How B. What C. Why D. This16. the house will be built will be discussed at tomorrow'smeeting.A. If B. Where C. That D. What17. .you come or

15、not is up to you.A. What B. If C. Why D. Whether18. Is true that the famous scientist will give us a lecture nextweek.A. that B. it C. is D. he19. 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. Anyone B. The

16、 person C. Whoever D. Who21. he really means is he disagrees with us.A. What, what B. What, that C. That, that D. That, what22.It has not been decided they will leave for Beijing.A. when B. that C. what D. why23. he will go to work in a mountain village surprises all of us.A. What B. That C. Whether

17、 D. If24. you don ' t like hisim none of my business.A. What B. That C. Who D. How25. all the inventions have in common is they have succeeded.A. What; what B. That; that C. what; that D. 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. believed