高中英语名词性从句讲解与专项练习(含答案)

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, why, wh- ever

名词性从句连接词的选用

一、that 和what的选用：

that 和what都可引导所有的名词从句。但是，what除起连接作用外，还在名词性从句中充当成分，可做从句的主语、宾语、或表语。而that在名词性从句中不充当任何成分，只起连接作用。

二、if 和whether 的选用

不能使用if 的情况：

a. 主语从句句首

b. 表语从句，同位语从句

c. if引起歧义

d. 介词后的宾语从句

e. 与to do连用 f .whether or not 连在一起引导宾语从句时不用if

三、其它连接代词和副词的连用

主要根据名词性从句中的具体意义,正确的选择who、which、when、where、why、how 等连接词，这些连接词既具有疑问含义，又起连接作用，同时在从句中充当各种成分。

四、引导词that 的省略

that 可省略的情况：单个宾语从句中的that可省略

that不可省略的情况：a.主语从句b.表语从句c.同位语从句d.用it做形式宾语的宾语从句e.并列的宾语从句中，后几个从句的引导词that 不能省略

五、同位语从句的引导和辨别

1.同位语从句的格式：n.+ 连接词+ 从句

2.能接同位语从句的名词有：fact、idea, news, information, order, belief, suggestion, advice等.

3.连接词通常是that,也可根据含义选用whether, what, when, where 等来引导同位语从句.

4.中心词是“意见、建议、命令”从句要用虚拟（should）do

六、同位语从句和定语从句的区别

1.定语从句是先行词的修饰语。从句中that充当成分，做宾语时可省略。

2.同位语从句表明中心词的具体内容。that 在同位语从句中不做任何成分,只起连接作用,无具体含义,且不可省略.

判断从句类型

七、宾语从句的时态呼应

1. 如果主句时态是现在时或将来时,从句谓语可根据句意需要而选用任一种时态.

2. 如果主句时态是过去式，从句要改成相应的过去式

八、it做形式主语

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

班级：姓名：评分：

一、用that或what填空

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.Is _____ he told us true ?

6.We should pay attention to ______ the teacher is saying.

7. I have no doubt _____ he will come.

8. I have no idea _____ he did that afternoon.

9._____ has made China_____ it is now?

10. we can’t get seems better than we have .

11.A computer can only do you instructed it to do .

12.He became so angry he couldn't speak .

13.There is the city we visited last year .

14.There is no doubt the price of cars will go down .

15.None of us has a clear idea the others want to do .

16.Do he or she tells you to do .

17. he did surprised us .

18. he did so surprised us .

19.This is all I know.

20.This is I know.

二、用if 或whether填空

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.

8. I don’t kn ow _______ to go.

9.______ you are not free tomorrow, I’ll go without you.

10.It depends on she will come.

11.I have no idea he will be back .

12.We must stick to our promise or no .

13. It is valuable ,I can't say .

14.I don’t know he is lying or not.

15. I didn’t know to go home or stay at home..

三、用适当的连词填空：

1.__ _ you don’t like him is none of my business.