我名词性从句老搞不清楚，怎么办?

语法中文太多，有的词分不清，例如whether 和if ,that的用法……

名词性从句共有四种:主语从句,表语从句,宾语从句和同位语从句

1． 主语从句：主语从句在整个句子中作主语。
(1)不同于其它的连词，它不充当句子的成分，只是单纯的连接词，通常不可以省略。分句置于句首时，that绝对不可以省略。
That the driver could not control his war was obvious.
It was obvious that the driver could not control his car.
(2)if 不能用在主语从句中，而是用whether
Whether he left (or not) is unknown
(3)当主语从句作主语时，谓语动词一般用第三人称单数，下面这个句型例外。
What we need is more time and money.
What we need are many more books.


2.表语从句：表语从句出现在系动词后，充当表语。
The trouble is that we are short of money.
Go and get your coat. It’s where you left it.
(1) 引导表语从句除了上述三类词外还有because, as if/ as though等等
The reason (why/for which…..) is that ……
It/This/That is because……
(2) 连系动词“appear, look, seem”的两个常用句型
It seems/appears that….
It looks/seems as if/as though……(与事实相符用陈述语气，与事实相反用虚拟语气)
(3) as 也可以引导表语从句
Things are not always as they seem to be


3. 宾语从句：及物动词，形容词和介词后加宾语从句作其宾语。
(1) 宾语从句时态与主句相呼应，但宾语从句表示的是客观真理或普遍现象除外
The teacher told us that the earth moves around the sun
(2) 连词whether和 if可以互换，但注意下列情况
连词后紧跟or not时用whether
I want to know whether or not they will come.
作介词宾语是用whether引导宾语从句
He was interested in whether he saw her there.
连接词后直接加不定式，不能用if只能用whether
He doesn’t know whether to stay or not.
如果宾语从句是否定时，一般用if引导
I care if he will not attend the meeting.
(3) 当宾语从句后带宾补时，要用“主语+谓语+it +宾补+that-clause,that不可省略
I think it certain that she will do well in her exam.
(4) 当主语是I, we ，主句用think, believe, suppose, expect, imagine五个动词时，用否定转移
I don’t think he will win the game, will he?
(5) that在宾语从句常可以省略，但由and或 but连接两个或多个宾语从句时，仅可以省略第一个连词that
He said (that) he had eaten nothing but that he wasn’t hungry.
(6) 注意区别if引导的宾语从句和条件状语从句
I don’t know if he will come.
If he comes, I’ll let you know.


4.同位语从句，在句中作某些名词的同位语，对前面的名词进一步说明。用在下列名词 fact,news,idea,hope,believe,hope,thought,doubt.truth,order,suggestion, word etc.
(1) There is no doubt that he will come.
There is doubt whether he will come.
Word came that Napoleon would come to inspect them.
There is no possibility that….
(2) that引导的同位语从句与定语从句的区别：
在同位语从句中：that不可以省略，不作成分;定语从句的关系代词that在定语从句作成分，作宾语时可以省略
We are interested in the news that some foreigners would visit our school.
We are interested in the news that he told us.
when, where引导的同位语从句与定语从句的区别：
在定语从句中，when, where前有分别表示时间、地点的先行词；而在同位语从句中无此对应关系
They have no idea at all where he has gone.(同位语从句)
Go and get your coat. It’s in the place where you left it.(定语从句)


5. 疑问词-ever既可以引导名词性从句，也可以引导让步状语从句，而no matter+疑问词只能引导让步状语从句
No matter where I go, my heart is towards China.
I believer whatever he says. Whatever he says, I will never believe him.
who与 whoever的区别
who是“谁”的意思，表示具有疑问，who相当于anyone who“无论谁”
Whoever leaves the room last ought to turn off the lights.
Can you tell me who that gentleman is?


6．当名词性从句缺少主语、宾语或表语时，引导词通常用what，它相当于。另外，有时具有感叹意义all that, anything that或 the thing(s) that
What we can’t get seems better than what we have.
Tom thought what a beautiful girl Mary was.


7.注意区分it 作形式主语的主语从句与强调句
强调句句型It is/was+被强调部分+that, 去掉It is/was, that，句子仍然成立。
It is natural that they should have different views. 主语从句
It is only lately that he had had a family himself. 强调句
What was it that he wanted? I don’t know what it was that he wanted.
It was in the hotel where he stayed that we discussed the serious problem


8.注意it 作形式主语的主语从句和as引导非限制性定语从句引导的不同
It is known to all that the earth is round.
As is known to all. the earth is round.

题目：1．____he does has nothing to do with me.
A. whatever B. No matter what C. That D. If
2. The manager came over and asked the customer how____
A. did the quarrel came about B .the quarrel had come about
C. had the quarrel come about D. had the quarrel come about
3. Energy is ____makes thing work..
A. what B. something C. anything D. that
4. Information has been put forward ____ more middle school graduates will be admitted into universities.
A. while B. that C. when D. as
5. This is ___the shenzhou V Spaceship landed.
A. there B. in which C. where D. when
6. They have no idea at all____.
A. where he has gone B. where did he go
C. which place has he gone D. where has he gone
7. The doctor did a lot to reduce the patient’s fear ____he would die of the disease.
A. that B. which C. of which D. of that
8. The order came ___the soldiers ____the small village the next morning.
A. that ;had to leave B. that; should leave
C. /; must leave D. when; should leave
9. ___is no possibility ____Bob can win the first prize in the match.
A. There; that B. It; that C. there; whether D. It; whether
10. The question came up at the meeting_____ we had enough money for our research.
A. that B. which C. whether D. if
11. Is _____he said really true?
A. that B. what C. why D. whether
12.____the meeting should last two days or three days doesn’t matter.
A. That B. Whether C. If D. Where
13. It worried her a bit _____her hair was turning gray.
A. while B. if C. that D. for
14. ¬¬¬_____more countries can use natural energy in the future remains to be seen.
A. Whether B. This C. who D. If
15.____he will go to work in a mountain village surprises all of us.
A. What B. That C. Whether D. If
16. ____you don’t like him is none of my business.
A. What B. That C. Who D. How
17.____all the inventions have in common is ____they have succeeded.
A. What; what B. That; that C. what; that D. That ; what
18. ____appeared to me that he enjoyed the food very much.
A. What B. It C. All that D. That
19. It is widely ______that smoking can cause cancer.
A. believed B. think C. say D. hoped
20. ____caused the accident is still a complete mystery.
A. What B. That C. How D. Where
21. ____he always serves the people very well is known.
A. What B. That C. Which D. Who
22.____has passed the test will get a prize .
A. Whoever B. No mater who C. Whomever D. Who
23.Is____ true that the famous scientist will give us a lecture next week?
A that B it C his D he
24.It has not been decided ___ they will leave for New York.
A. when B why C that D what
25. Obviously___ we do morning exercises every day ___ us good.
A. that do B. if; do C what; does D. that; dose
26 It is said____ ____ was all ___ he said.
A that; that; that B what; what; what C that; which; what D that; that; which
27___ gets home first is to cook the supper.
A. Who B Whom C. Those who D. Whoever
28___ moved us most was___ he liked after the old man for more than twenty years.
A. That; that B. What; that C What; what D. That; what
29.___ you did it is not known to all.
A. Who B. What C. How D. Which
30.___ you do should be well done.
A How B. That C. Whatever D Why
31. The reason I plan to go is___ she will be disappointed if I don’t.
A. because B. that C. thanks to D. what
32. What time do you think__?
A. will Tom come back B. Tom will come back
C. is Tom coming back D. can Tom get here
33. The teacher said that light___ faster than sound.
A. Has traveled B. traveled C. had traveled D. travels
34..___ is still a question___ will win.
A. It; that B. It; who C. That; who D. This; that
35. If you know___ it was that write A Tale of Two Cities, raise your hand.
A. whom B. which C. who D. that
36. In some countries,___ are called “public schools” are not owned by the state.
A. that B. which C. as D. what
37. Thinking___ you know___ in fact you don’t is a terrible mistake.
A. that; that B. what; what C. that; what D. what that
38. Whether ways will be found to stop pollution or not is just___ worries the public.
A. why B. which C. that D. what
39. Why don’t you bring___ to his attention that you are too busy to do it?
A. that B. what C. that D. it
40.___ David says sounds right to Helen. That’s why she has made up her mind to leave with him___ happens.
A. whatever; whatever B. No matter what; whatever
C. No matter what; No matter what D. Whatever; however
41. That is___ I was born and grew up.
A. There B. in which C. where D. the place
42.___ she was invited to the ball made her very happy.
A. What B. That C. When D. Because
43.___ we are doing has never been done before.
A. That B. What C. Which D. Whether
44.---Have you found your book yet?
---No, I’m not sure___ I could have left it.
A. whether B. where C. when D. why
45. The doctor couldn’t answer the question___ the patient could survive that night.
A. if B. that C. whether D. what
46. I firmly believe___ he said at the meeting was right.
A. that B. which C. that what D. what that
47.---What were you trying to prove to the police?
---___ I was last night.
A. That B. When C. Where D. What
48. I think, though I could be mistaken, __ he liked me.
A. who B. which C. that D. what
49. At the meeting, we discussed___ we should employ more workers.
A. if B. whether C. that D. /
50. After___ seemed like hours he came out with a bitter smile.
A. which B. it C. what D. that


答案
1—5 ABABC 6—10 AABAC 11—15 BBCAB 16—20 BCBAA
21—25 BABAD 26—30 ADBCC 31—35 BBDBC 36—40 DCDDA
41—45 CBBBC 46—50 CCCBC