2020年高三英语语法讲解及练习题：名词性从句

重难点分析

名词性从句是历年高考的重点和难点，也是热点。名词性从句相当于名词，可作主句的主语、宾语、表语和同位语。因此，名词性从句可分为主语从句、表语从句、宾语从句和同位语从句（见下表）。

一、主语从句

主语从句是在复合句中充当主语的从句，通常放在主语谓语动词之前或由形式主语it代替，而本身放在句子末尾。如：

Who will go is not important. 谁将去不是重要的。

1. it作形式主语和it引导强调句的比较

it作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子每一部分进行强调，无论强调的是什么成分，都可用连词that。

被强调部分指人时也可用who/whom。如：

It is a pity that you didn’t go to see the film. (主语从句) 你没去看电影真是遗憾。

It is in the morning that the murder took place. （强调句）谋杀案发生的时间是在早晨。

2. 用it作形式主语的结构

2. 主语从句不可位于句首的五种情况

二、宾语从句

宾语从句是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词之后。

注意：that引导的从句常跟在某些形容词后作宾语，如：anxious, aware, certain, confident, convinced, determined, gald, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, satisfied, content等。也可将此类词后的从句看作是原因状语从句。

三、表语从句

表语从句是在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语+连系动词+表语从句”。可以接表语从句的连系动词有be, look, remain, seem等。引导表语从句的引导词that一般不省略。另外，常用的含有表语从句的结构还有“The reason is that…”，“It is because…”，“That’s why…”等。如：The reason he is late for school is that he missed the early bus. 他上学迟到的原因是他错过了早班车。

四、同位语从句

同位语从句是在复合句中作名词的同位语的名词性从句。

五、whether, if引导名词性从句的区别

注意：doubt作“怀疑”解，后接宾语从句时，如主句是肯定的，宾语从句用whether或if

引导，如主句是否定，宾语从句只能用that引导。如：

I doubt whether/if he is fit for the job. 我怀疑他是否胜任这份工作。

I don’t doubt that he can do it very well. 他能把它做好，我不怀疑。

考点练透

一、单句填空用适当的连词填空，补全下列句子。

1. I can’t decide dictionary I would buy.

2. That’s he refused my invitation.

3. I am very interested in he has improved his pronunciation in such a short time.

4. we need is more time.

5. The fact she had not said anything at the meeting surprised everybody.

6. and they will meet has not been decided yet.

7. Please tell me you are waiting for.

8. Is that you are looking for?

9. Would you please tell me the nearest post office is?

10. I don’t know he will agree to the plan or not.

11. is done cann’t be undone.

12. Take care you don’t make mistakes in the coming exam.

13. To his surprise, the umbrella was not he had put.

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

15. he is willing to come is not important.

16. they are most interested in is they can produce more and better cars.

17. It doesn’t matter I rest or not.

18. I have will be yours sooner or later.

19. I think it is you are eating too much.

20. Can you make sure Alice has put the gold necklace?

21. —Do you remember he came?

—Yes, I do. He came by train.

22. Mother asked me was wrong with me.

23. they have won the game made us excited.

24. he says in his report is a very interesting question.

25. That is he failed to arrive on time.

二、语篇填空根据短文意思用适当的词填空。

I don’t know 1 you have noticed 2 some students don’t want to walk to school. It can be seen every day 3 their parents drive them to school. But nowadays, it should be brought to our notice 4 the air is seriously polluted. 5 can we do about it? Here I have a suggestion 6 we should ride on our bike to school! 7 we can do it will not only have significant benefits for our health, 8 also help improve our environment. 9 we will have a better environment depends on 10 we can do for ourselves and for nature.

三、语法填空阅读下面短文, 在空白处填入一个适当的单词或括号内单词的正确形式。

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