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If 引 导 的 条 件 状 语 从 句
引导条件状语从句最常用的连词是if
1.常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生
的概率也是很高的。如： If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail
in the exam，you will let him down．如果你考试不及格，你会让他失望的。 If you have finished the
homework， you can go home．如果你作业做完了就可以回家了。
2. if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设。从句多用一
般过去时或过去完成时，表示对现在或过去的一种假设。如： If I were you，I would invite him to the
party．如果我是你，我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught
in the traffic．要不是交通堵塞，我本会来得早一些。
另外,你还要注意if 条件句的时态搭配:
1. 主句用一般将来时，if从句用一般现在时，简称“主将从现”
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例如： 1） If he runs，he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。
2） The cat will scratch you if you pull her tail. 如果你拉猫的尾巴，它就会抓你。
2.主句用must/may/might/can/should 等情态动词时， if从句用一般现在时，简称“主情从现”
例如： 1） If the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改
在别的机场降落。 2） If it stops snowing we can go out. 如果雪停了，我们就可以出去。
3．主句是祈使句时，if从句用一般现在时，简称“主祈从现”。
例如：Study hard,if you want to get good grades.
注意 ： 在 if 引导的条件状语从句中，if 和条件句可以直接放在主句后面，不加逗号；若 if 条件句放
在主句之前，后面要加逗号与主句隔开。
一、用所给词的适当形式填空
1.If you ________(feel) tired, you _______________ (have) to have a rest.
2.If there __________(be) fewer trees, there _______________( be) more pollution.
3. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.
4.Lana ________________( buy) a new dress if the old one ____________(be) out of style.
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5.Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.
6. If Mr Green ___________(say) I am hard- working, my parents _________( feel) glad.
7.I ____________(go) to the beach if it________________ ( not rain) this week.
8.He ____(write) a letter to his grandparents if he ____(get) his report card this week.
9. If she ____________(get) up late, she _____________ ( not catch) the early bus.
10.Peter ________(major) in English if he ____(pass) the exams in Peking University.
二、根据汉语翻译句子：
1. 如果努力学习，你就会取得好成绩。 If you__________ _________, you ___________ good
_____________. 2. 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. 3. 如果我们为他组织生日聚会，大家都会来的。
Everyone ________________ if we _____________ a birthday party __________ him.
4. 如果明天不下雨，我会和你一起去公园的。
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If it __________ __________ tomorrow, I ______________ go to the park _________ you.
5. 如果他有空，他会帮助你的。 If he _________________, he _________________ you.
6. 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.
三、单项选择（15分）1.If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going
2.It will be a long time ____ Peter _____ his work.
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A. since, has finished B. after, finishes C. when, will finish D. before, finishes.
3. What will father _____ us from Japan? A. take B. bring C. carry D. make
4. Weifang is famous ______ kites. A. for B. to C. on D. with
5. 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
6. --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
7.—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
8. What will you do if you _____ to the old folk’s home visit? A. go B. went C.going D. will
go
9. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too
10. I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming
D. came
11. There ____an English film in our school tomorrow.
A. is going to have B. will have C. is going to be D. has
12. Could you tell us where ____？A. will the next Olympic Games held B. the next Olympic Games
will be held C. would the next Olympic Games be held D. the next Olympic Games would be held
13. When my mother returned last night, I ___ a book. A. read B. am reading C. was reading D. am
going to read 14.What ____ you ____ when it began to rain? A. do, do B. were, doing C. are, doing
D. did, do
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15. I’ll wake you up when he ____back. A. will B. is going to come C. comes D. come
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