初中英语――条件状语从句（讲解&练习）
Ⅰ条件状语从句的定义
Ⅱ条件状语从句的引导词
1.if引导的条件状语从句
表示在某种条件下某事很可能发生。
If we pay much attention to the earth, we'll have a better world.
如果我们多关爱地球，就会拥有一个更美好的世界
If it rains tomorrow, what shall we do?
如果明天下雨，我们怎么办？
注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。
What would happen if there were no water ?
如果没有水会怎样？
2.unless引导的条件状语从句
unless的意思是如果不，除非。
可与if...not互换。
You will fail in English unless you work hard.
你英语考试会不及格的，除非你更加努力。
3.as /so long as引导的条件状语从句
as /so long as意思是“只要”
So long as you're happy,i will be happy.
只要你高兴，我就高兴。
Ⅲ条件状语从句的种类
Ⅳ条件状语从句的时态原则
注意：
学习" if " 引导的条件状语从句的用法,现在总结一下:
if 条件句不一般,几个要点记心间;
条件句,放在前, 逗号要放句中间。
条件句表真实，主将从现要遵从；
条件句非真实，虚拟语气用到位。
练习
Ⅰ.单项选择
（）1.If you _____ to the part y, 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. What will you do if you _____ to the old folk’s home?
A. go
B. went
C. going
D. will go
（）5．I’ll give the book to him if he ___ here next Sunday.
A. will come
B. comes
C. is coming
D. came
Ⅱ.用所给词的适当形式填空
6..If you ________(feel) tired, you _______________ (have) to have a rest.
7. Where _______ he _________(see) the film if he ________________(have) time?
8. If there __________(be) fewer trees, there _______________( be) more pollution.
9. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot. 11. Lana ________________( buy) a new dress if the old one ____________(be) out of style.
12.The twins ______________(fight) if they_______________(argue).
13. I ____________(have) a bake sale if I _____________(need) money for education.
14. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.
15. I ____________(go) to the beach if it________________ ( not rain) this week.
17. __________they __________( have) a match if the P.E. teacher _____________(be) busy?
18. If she ____________(get) up late, she _____________ ( not catch) the early bus.
Ⅲ.翻译下列句子
19..如果他到的晚了会发生什么事情？
What _______________ if he _____________ late?
20. 如果努力学习，你就会取得好成绩。
If you__________ _________, you good marks.
21. 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.
22. 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. 23. 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.
24. 如果她睡过头了，就会旅游迟到的。
She;__________________________ the trip if she ___________________.
25. 如果他有空，他会帮助你的。
If he _________________, he _________________ you.
26. 如果Tom考试不及格，他就没有机会上高中了。
Tom _________have the ________to go to the ________high school if he ________ the exams.。