状语从句引导词省略及练习

状语从句引导词

状语从句的简化

♠状语从句的省略

状语从句同时具备下列两个条件:

①主句和从句的主语一致，或从句主语为it；②从句主要动词是be的某种形式。从句中的主语和be动词常可省略。例如：

When ( the lab is ) completed ,the lab will be open to the public . He’ll go to the seaside for his holiday if (it is ) possible.

另外，比较状语从句经常省略。例如：

I’m taller than he (is tall ).

The higher the temperature (is), the greater the pressure (is ).

状语从句的"简化"现象常存在于以下五种状语从句中:①由if, unless等引导的条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的时间状语从句;④由as, as if等引导的方式状语从句;⑤由as,than等引导的比较状语从句。

(1)当状语从句的主语是it,且谓语动词是be时,it和be要完全简化掉。例如: If (it is) possible, he will help you out of the difficulty.

You must attend the meeting unless (it is) inconvenient to you.

(2)当状语从句的主语和主句的主语一致时,从句可以将主语和be动词简化掉。

a.连词+形容词

As (he was) young, he learned how to ride a bike.

Whenever (she is) free, she often goes shopping.

Work hard when (you are) young, or you'll regret.少壮不努力,老大徒伤悲。

b.连词+名词

While (he was) a young boy, he was always ready to help others. Although (he was) a farmer, now he is a famous director.

c.连词+现在分词

As (she was) walking along the river bank, she was singing a pop song. Although (he is) doing his best in maths , he has still got no good marks.

d.连词+过去分词

He won't go there with us unless (he is) invited.

The concert was a great success than (it was) expected.

e.连词+不定式

He stood up as if (he were) to say something.当时他站起来好像要说什么。He wouldn't solve the problem even if (he were) to take charge.

f. 连词+介词短语

She looked anxious as though (she was) in trouble. He had mastered the English language before (he was) in the USA.

注意:当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用独立主格结构来表达。例如:

When the meeting was over, all the people went out of the meeting-room.当会议结束时,人们都走出了会议室。(=The meeting over,

状语从句巩固练习

1. John shut everybody out of the kitchen ______he could prepare his grand surprise for the party. A. which B. when C. so that D. as if

2. I would appreciate it ____you give me a hand this afternoon.

A. until

B. if

C. when

D. that

3. education is about learning and the more you learn，________.

A. the more for life are you equipped

B. the more equipped for life you are

C. the more life you are equipped for

D. you are equipped the more for life

4.After the war，a new school was put up ________there used to be a theatre.

A. that

B. where

C. which

D. when

5. —Is Mr. Smith in the office?

—Yes，________ he is in charge of the office，he must be there.

A. since

B. however

C. whether

D. for

6. As your good friend, I will do ________help you.

A. that I can to

B. what I can to

C. all that I can

D. what I can

7.John may phone tonight. I don’t want to go out ________he phones.

A. as long as

B. in order to

C. in case

D. so that

8.Someone called me up in the middle of the night，but they hung up ________I could answer the phone. A. as B. since C. until D. before

9. —Don’t look down upon Bob. He has his own advantages.

—Oh, yes. ________others are weak, he is strong.

A. If

B. When

C. Where

D. Though

10.It is ten years ________he smoked.

A. that

B. when

C. since

D. while

11.We must hurry up ________catch up with the last train.

A. that

B. so that to

C. in order that

D. in order to

12.No matter ________hard it may be，I will carry it out.

A. what

B. whatever

C. how

D. however

13.________ you may do，you must do it well.

A. Which

B. Whenever

C. Whatever

D. When

14. —Are you thinking about going to New York for the holiday?

—No. But if I ________the time，I would definitely go.

A. have

B. had

C. have had

D. would have

15.________ you are so weak，you’d better stay at home.

A. Since

B. For

C. Because

D. Though

16.English and French are taught here. You can choose ________you like.

A. no matter which

B. whichever

C. which

D. whatever

17.I saw Mr. Smith last Sunday. We had not seen each other ___I left London.

A. as

B. before

C. since

D. till

18.I’ll be back before you ________.

A. will leave

B. will have left

C. leave

D. would leave

19.The problem won’t be settled until we ___a chance to discuss it thoroughly.

A. have had

B. will have

C. will have had

D. would have