定義：名詞性從句是由if, whether, that, how和各種疑問詞充當連接詞所引導的從句，其功能同名詞一樣。
1、主語從句：在復合句中做主句的主語。引導詞有連詞that (that 不可省),whether; 代詞有who, what ,which; 副詞 when ,where, how, why 等。如:
A. That he is a famous singer is known to us. (It is known to us that he is a famous singer.)
B. When he will go to America is not yet fixed. (It is not yet fixed when he will go to America.)
2.賓語從句：在復合句中做主句的賓語.引導詞有連詞that (that 常可省略),whether, if; 代詞有who, whose, what ,which; 副詞 when ,where, how, why 等。如:
A. We believe (that) he is honest. B. I told him (that) I would come back soon.
C. He said (that) he would go there the next day and that his family wouldn’t go there.
3、表語從句：在復合句中做主句的表語.引導詞有連詞that (that 不可省),whether; 代詞有who, what ,which;副詞 when ,where, how, why 等。如: A. The problem is that we didn’t get in touch with him. B. This is how Henry solved the problem.
(如果句子的主語是suggestion, advice, order等名詞時,后面引導的表語從句用should+動詞原形,should可省略.)
4、同位語從句：在句中起同位語的作用.一般放在名詞 fact , news , idea , promise, thought , suggestion等之后,用以說明或解釋前面的名詞。引導詞有連that；少數情況下也可用連接副詞等。如：
A. The thought that we might succeed excited us.
B. The idea that they should try a second time is worth considering.
C. The suggestion that the plan (should) be delayed will be discussed tomorrow.
1、注意that 的用法(that引導名詞性從句時在從句中不做任何成分，也沒有具體的意義。其他連接詞在引導從句時都做相應的成分并有具體的意思。) ①主語從句、表語從句、同位語從句中用that但不能省略。如：
A. That they are good at English is known to us all.
B. The problem is that we don’t have enough money.
C. She expressed the hope that they would come to China one day.
略； 當that 從句與另一名詞性從句并列作賓語時，that不能省； 當that作介詞賓語時，that不可省掉。如：
A. He judged that because he was a child, he did not understand what he had
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B. Everyone knew what happened and that she was worried.
C. The reason lies in that she works harder than the others do. ③that從句做主語和賓語時，可以用it 來替換成以下幾種結構表達。 (A) It is clear/certain/likely/true/surprising that?
(B)It is a pity/shame/good idea/no wonder that ...
(C)It is said/reported/ believed/known/thought/suggested that ?
(DIt seems/happens that。如：
It happened that I went out last night. It is said that China will win in the World Cup
B.定語從句中關系詞代替先行詞在從句中做成分;而在同位語從句中連接詞不做成分。 C.定語從句是對前面的名詞進行修飾，同位語從句是對前面的名詞進行解釋說明。 The news that our team has won the final match is encouraging.
The news that you told us is really encouraging. （定語從句）
The suggestion that students should learn something practical is worth considering.
The suggestion that is worth considering is that the students should learn something practical.
It all depends on whether they will come back. ②
or not 時用whether
如： I didn’t know whether or not he had arrived in Wuhan..
Whether the meeting will be put off has not been decided yet. The question is whether they have so much money.
We ought to discuss carefully the question whether we can do it or not. ④whether常與or連用表示一種選擇，if不能這樣用；whether也可與動詞不定式連用
The question of whether they are male or female is not important. I have not decided whether to go or not. ⑤whether可引導一個讓步狀語從句表示“不管”、“無論”，而if不能。If表示“如果”
如： Whether he comes or not, we will begin our party on time.
If I have enough time, I will play football.
4、疑問詞 + ever和no matter + 疑問詞的區別：
①疑問詞 + ever可引導名詞性從句，在主從句中要充當一定的部分。如：
Whoever breaks the rule must be punished. You can choose whatever you like in the shop.
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②疑問詞 + ever還可引導讓步狀語從句。如：
Whoever breaks the rule, he must be punished. Whatever you do, you must do it well.
③no matter + 疑問詞只能引導讓步狀語從句。如：
No matter what you do, you must do it well. No matter who breaks the rule, he must be punished.
然主句是過去時態，從句仍用一般現在時。如： Hello,I didn’t know you were in London. How long have you been here? The teacher told us that light travels at a very high speed.
② 主語從句做主語相當于單數第三人稱作主語，謂語動詞用單數，如果由and 連接兩
When the meeting will begin has not been decided yet.
When they will start and where they go have not been decided yet. When and where the meeting will begin has not been decided. ③ 名詞性從句在句中要用陳述句語序。如：
He asked me what was the matter with me.
We’ve heard the news that well move into the new house. Whatever you say will interest us all.
① 強調句 It is/was +強調部分＋that??.(如果強調部分是疑問詞)
eg. Who is it that spoke first? When was it that they came here? ② 關于doubt
sb. doubt if/whether?.. sb. don’t/doesn’t doubt that ??. There is no doubt that ??.
Eg. There is no doubt that he will win the game. ③ 疑問詞＋do you think+(用陳述句語序) eg. Who do you think we invited to give us the talk?
名詞性從句連接詞的選用 （1）that 和what 的選用 1.______ he wants is a book. 2. ______ he wants to go there is obvious. 3.The result is ______ we won the game. 4.This is _____ we want to know. 5.We should pay attention to ______ the teacher is saying.
6. I have no doubt _____ he will come. 7. I have no idea _____ he did that afternoon.
(2) if 和whether 的選用
1. I asked her ____ she had a bike. 2.______we will hold a party in the open air tomorrow depends on the weather.
3. We’re worried about ________ he is safe. 4. I don’t know ___________ he is well or not.
5. I don’t know ________ or not he is well. 6. The question is _________ he should do it.
7.The doctor can hardly answer the question ______ the old man will recover soon.
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________ we shall hold our sports meeting is not decided. I don’t know _________ broke the glass yesterday.
I have no idea _________ he looks like. This is _________ I left my glasses. 引導詞that 的省略
1.I don’t think ________ she is coming. 2.It is a pity ________ he has made such a mistake.
3.The reason is _________ he is careless .
4.The news ________ our team won the match inspired us.
5.I don’t think it necessary _________ you should read English aloud.
6.He told me __________ his father had died and __________ he had to make a living alone.
同位語從句的引導和辨別 that/ whether / where/ how
1. I have no idea _________ he comes from.
2. He can’t answer the question ________ he got the money.
3. He gave us many suggestions ________ we should get up earlier and take more exercise.
4. I have no doubt ___ he will win.
練習 1. It now appears ______ they are in need of help. A. that B. which C.what D. how
2. It is good news ______ they will arrive in a few days.
A. which B. what C. that D. how 3. It ______ Joe drives badly. A. thought that B. thinks what C. is thought what D. is thought that
4.It ______ he is late for class. A. may that B. might that C. may be that D. might be what
5. This is ______ she was born. A. where B. which C. that D. what
6. The question is ______ we can’t go there today. A. that B. what C. which D. when
7.The question is ______ it is worth doing. A. if B. whether C. which D. what
8. The reason he has made such great progress is _______ he has never wasted his time.
A. because B. why
C. that D. what
9. My suggestion is ______ we should turn the land into rice fields. A. what B. that C. which D. where
10. His proposal is that the dam ______ at the foot of the mountain. A. build B. will built C. be built D. will be built
11.My advice is that he ______ regular house. A. keep B. would keep C. keeps D. kept
12.We all know the truth _____ the earth goes round the sun.
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A. that B. which C. what D. whether
（NMET’96）：____ we can’t get seems better than ____ we have. A. What; what
B. what; that C. That; that D. That; what
（MET92）：____ the 2000 Olympic Games will be held in Beijing is not known yet. A. Whenever B. If C. Whether D. That （MET91）:No one can be sure ____ in a million years.
A.。 what man will look like B. what will man look like C. man will look like what
D. what look will man like
（NMET97）：It is generally considered unwise to give a child ____ he or she wants. A. however
C. whichever D. whenever
（NMET’99）：— I drove to Zhuhai for the air show last week.
— Is that ____ you had a few days off?
B. when C. that
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