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期末英语复习八年级英语 if条件状语从句+巩固练习

更新时间:2020-12-19浏览:评论: 条

概念引入

 

英国前首相撒切尔夫人(Margaret Thatcher)曾用if条件句对男人和女人进行评价:

 

In politics, if you want someone to make a speech, ask a man; if you want something done, ask a woman. 在政治领域,如果你想要有人发表演说,那就找男士去;而如果你想真正把事情解决,那就找女士。

 

用法讲解

 

一、概念

 

连词if的意思是“如果”,它引导的句子表示某事发生所需要的条件,即“在……条件下某事才能发生”,在句子中充当状语,因此我们称之为条件状语从句。在复合句中连词if引导的句子为从句,被修饰的句子为主句。从句可以放在主句后,也可以放在主句前,从句放在主句前时,应用逗号将它与主句隔开。例如:

 

We’ll go to the Great Wall if it doesn’t rain tomorrow. = If it doesn’t rain tomorrow, we’ll go to the Great Wall. 如果明天不下雨,我们就去长城。

 

二、用法

 

1. 条件状语从句通常由连词if引导,意为“如果,假如”,主句不能用be going to 表示将来,而应该用shall或will。例如:

 

If I’m free tomorrow, I’ll go with you. 如果我明天有空,我将会和你一起去。

 

2. if引导的条件状语从句,主句用一般将来时,从句则用一般现在时,即“主将从现”。例如:

 

If it is sunny tomorrow, I’ll climb the hill. 如果明天天气晴朗,我将去爬山。

 

3. 正确区分if引导的条件状语从句和if引导的宾语从句。

 

在条件状语从句中,if表示“如果”;而在宾语从句中,if表示“是否”。可以用下面的方法区分:

 

1) 从句前置法:if引导的条件状语从句,可以放在主句之前并用逗号隔开,也可放在主句之后;而if引导的宾语从句只能放在主句之后。因此如果把if放在主句之前,句子通顺,意义不变,则是条件从句,否则是宾语从句。例如:

 

He will help you if you ask him. = If you ask him, he will help you.

 

如果你问他,他会帮助你。

 

2) whether替换法:if引导宾语从句时,其意为“是否”,通常可用whether替换,意义不变,而if引导条件状语从句时不能用whether替换。因此,可用whether替换的是宾语从句,不能替换的是条件从句。例如:

 

I want to know if you will go tomorrow. = I want to know whether you will go tomorrow.

 

我想知道你明天是否去。

 

注意:区分if的用法有着极为重要的意义,因为在条件状语从句中,主句用将来时,从句用一般现在时;而在宾语从句中,当主句是一般现在时,从句可用所需的任何时态,主句是一般过去时,从句用过去的某种时态。

 

巩固练习

 

一、单项选择

 

1. If you _____ to the party, you’ll have a great time.

 

A. will go

 

B. went

 

C. go

 

D. going

 

2. I ______ her the answer if she _____ me.

 

A. can tell, will ask

 

B. will tell, will ask

 

C. would tell, ask

 

D. will tell, asks

 

3. — What are you going to do tomorrow?

 

— We’ll go to the library tomorrow if it ______.

 

A. isn’t rain

 

B. rain

 

C. won’t rain

 

D. doesn’t rain

 

4. — Do you know when he will come back tomorrow?

 

— Sorry, I don’t know. When he ______ back, I’ll tell you.

 

A. comes

 

B. will come

 

C. come

 

D. may come

 

5. I’ll give the book to him if he ____________ here next Sunday.

 

A. will come

 

B. comes

 

C. is coming

 

D. came

 

6. There ____________ an English film in our school tomorrow.

 

A. is going to have

 

B. will have

 

C. is going to be

 

D. has

 

7. I’ll wake you up when he ____________back.

 

A. will

 

B. is going to come

 

C. comes

 

D. come

 

8. The football match will be put off if it ________.

 

A. will rain

 

B. rains

 

C. rained

 

D. is rained

 

9. There ________ a basketball game this afternoon.

 

A. is going to have

 

B. will be

 

C. is going to play

 

D. will play

 

10. I won’t go if it ________ tomorrow.

 

A.rain

 

B.is raining

 

C.rains

 

D.will rain

 

二、用所给词的适当形式填空

 

1. If you ________(feel) tired, you _________ (have) to have a rest.

 

2. Where ________ he ________ (see) the film if he _________(have) time?

 

3. If there ________ (be) fewer trees, there ________ (be) more pollution.

 

4. He ________ (dress) more casually if he ________ (not work) on weekends.

 

5. If Marcia ________ (live) alone, she ________ (keep) a pet parrot.

 

6. Lana ________ (buy) a new dress if the old one ________ (be) out of style.

 

7. The twins ________ (fight) if they________ (argue).

 

8. I ________ (have) a bake sale if I ________ (need) money for education.

 

9. Peter ________ (send) me a beautiful souvenir if he ________ (go) to Spain.

 

10. If Mr. Green ________ (say) I am hard- working, my parents ________ (feel) glad.

 

11. I ________ (go) to the beach if it ________ (not rain) this week.

 

12. ________they ________ (have) a match if the P.E. teacher________ (be) not busy?

 

13. He ________ (write) a letter to his grandparents if he ________ (get) his report card this week.

 

14. If she ________ (get) up late, she ________ (not catch) the early bus.

 

15. Peter ________ (major) in English if he ________ (pass) the exams in Peking University.

 

三、完成句子

 

1.如果他迟到了,会发生什么事情?

 

What _______ ________ if he _______ late?

 

2. 如果努力学习,你就会取得好成绩。

 

If you_______ _______, you _______ _______ good _______.

 

3. 他如果看电视太久了,他的父母会不高兴。

 

If he _______ TV too much, his parents _______ _______ unhappy.

 

4. 如果我们为他举办生日聚会,大家都会来的。

 

Everyone _______ _______ if we _______a birthday party _______ him.

 

5. 如果明天不下雨,我会和你一起去公园的。

 

If it _______ _______ tomorrow, I _______ go to the park _______ you.

 

6. 如果她睡过头了,就会误了开会的。

 

She _______ _______ _______ _______ the meeting if she _______ _______.

 

7. 如果他有空,他会帮助你的。

 

If he _______ _______, he _______ _______ you.

 

8. 如果Tom考试不及格,他就没有机会上高中了。

 

Tom _______ miss the chance to go to the high school if he _______ the exams.

 

9. 你如果抄同学的作业就不能学好各门功课。

 

You _______ _______ good at all the subjects if you _______ the other students’ homework.

 

参考答案

 

一、单项选择。

 

1. C。本题是if引导的条件状语从句,主句用一般将来时,从句用一般现在时,即“主将从现”,所以答案为C。

 

2. D。根据句意“如果她问我,我就告诉她答案。”可知本句是if引导的条件状语从句,主句用一般将来时,从句用一般现在时,从句的主语为单三,动词后加-s,所以答案为D。

 

3. D。条件状语从句,主句用一般将来时,从句用一般现在时,rain在此是实义动词“下雨”的意思,故答案为D。

 

4. A。根据“主将从现”可知本句答案为A。此题是when引导的时间状语从句。

 

5. B。根据“主将从现”可知答案为B。

 

6. C。be going to do,will do都可以表示将来的动作,但只有选项C符合There be句型要求。

 

7. C。根据“主将从现”可知答案为C。

 

8. B。根据“主将从现”可知答案为B。

 

9. B。本题考查there be句型的一般将来时,there will be,故答案为B。

 

10. C。根据“主将从现”可知答案为C。

 

二、用所给词的适当形式填空

 

1. feel; will have

 

2. will; see; has

 

3. are; will be

 

4. will dress; doesn’t work

 

5. lives; will keep

 

6. will buy; is

 

7. will fight; argue

 

8. will have; need

 

9. will send; goes

 

10. says; will feel

 

11. will go; doesn’t rain

 

12. Will; have; is

 

13. will write; gets

 

14. gets; won’t catch

 

15. will major; passes

 

三、完成句子

 

1. will happen; is

 

2. study hard; will get; grades

 

3. watches; will be

 

4. will come; have; for

 

5. doesn’t rain; will; with

 

6. will be late for; sleeps late

 

7. has time; will help

 

8. will; fails  9. won’t be; copy

 

 

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