在句子中做条件状语的从句称为条件状语从句。可置于句首、句尾，有时还可置于主语和谓语之间。引导条件状语从句的连接词有：if ,unless,as/so long as等
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。
4.once引导的条件状语从句
once引导的条件状语从句，意为―一旦...，就‖，从句可置于主句前或后
Once you begin,never stop.
一旦开始，就绝不要停止
Maths is easy to learn once you understand the rules.
一旦你理解了规则，数学就不难学了。
提示：在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
If the weather is bad next week, we'll put off the climbing.
如果下周天气不好，我们将推迟爬山。
Father told me if i worked hard he would buy me a gift.
爸爸告诉我，如果我努力学习，他会给我买一份礼物。
If the weather is bad next week, we'll put off the climbing.
I.选择最佳答案.
( ) 1.If it ______ sunny tomorrow, I ____ boating.
a. is go b. will be, go c. is, will go d. will be, will go
( ) 2.----what will you do if it ______ tomorrow,
----I’ll stay at home and watch TV. a. rain b. rains c. will rain d. is raining
3 Run fast, or you’ll be late for school.
_______ you _______ _______ fast, you’ll be late for school.
4. You can buy the dictionary if you take enough money with you.
Take enough money with you, ______ _____ ______ buy the dictionary.
5 If there is no air, none of us can live.
None of us can live _______ _________.
6. 如果明天有空，我和你一起参观长城。
_______________________________________________
7 如果我们骑自行车去上班，我们可以避免空气污染。
______________________________________________
8 如果明天他不来,我会代替他去的。
_______________________________________________
9. I don't know wheather he _______( come) tomorrow.
If he______( come), I'll tell you．
10 We will go to the park unless it _______ ( rain )
11If he ___in half an hour,we ___wait for him.
A.won't come ,won't B.won't come ,don'tC.doesn't come ,won'tD.will come ,don't 12如果他考试不及格,他的母亲会难过的.
His mother____ ____ ____ if he ____ pass the exam.
13如果他明天起床不够早的话,就不能赶上早班车
If he ___ get up early ___,he ___ be able to catch the early bus.
141.If you _____ to the party, you’ll have a great time.
A. will go B. went C. go D. going
15. It will be a long time ____ Peter _____ his work.
A. since, has finished B. after, finishes C. when, will finish D. before, finishes. 16 What will father _____ us from Japan?A. take B. bring C. carry D. make
17. Weifang is famous ______ kites. A. for B. to C. on D. with
18． 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 19 – 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
20.—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
21. What will you do if you _____ to the old folk’s home visit?
A. go B. went C.going D. will go
22. If I eat ____ food, I’ll be very fat.
A. too many B. many too C. too much D. much too
23. I’ll give the book to him if he ___ here next Sunday.
A. will come B. comes C. is coming D. came
24. There ____an English film in our school tomorrow.
A. is going to have B. will have C. is going to be D. has
24. 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
25. When my mother returned last night, I ____ a book.
A. read B. am reading C. was reading D. am going to read
26.What ____ you ____ when it began to rain?
A. do, do B. were, doing C. are, doing D. did, do
27. I’ll wake you up when he ____back.
A. will B. is going to come C. comes D. come
在句子中做条件状语的从句称为条件状语从句。可置于句首、句尾，有时还可置于主语和谓语之间。引导条件状语从句的连接词有：if ,unless,as/so long as等
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。
4.once引导的条件状语从句
once引导的条件状语从句，意为―一旦...，就‖，从句可置于主句前或后
Once you begin,never stop.
一旦开始，就绝不要停止
Maths is easy to learn once you understand the rules.
一旦你理解了规则，数学就不难学了。
提示：在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
If the weather is bad next week, we'll put off the climbing.
如果下周天气不好，我们将推迟爬山。
Father told me if i worked hard he would buy me a gift.
爸爸告诉我，如果我努力学习，他会给我买一份礼物。
If the weather is bad next week, we'll put off the climbing.
I.选择最佳答案.
( ) 1.If it ______ sunny tomorrow, I ____ boating.
a. is go b. will be, go c. is, will go d. will be, will go
( ) 2.----what will you do if it ______ tomorrow,
----I’ll stay at home and watch TV. a. rain b. rains c. will rain d. is raining
3 Run fast, or you’ll be late for school.
_______ you _______ _______ fast, you’ll be late for school.
4. You can buy the dictionary if you take enough money with you.
Take enough money with you, ______ _____ ______ buy the dictionary.
5 If there is no air, none of us can live.
None of us can live _______ _________.
6. 如果明天有空，我和你一起参观长城。
_______________________________________________
7 如果我们骑自行车去上班，我们可以避免空气污染。
______________________________________________
8 如果明天他不来,我会代替他去的。
_______________________________________________
9. I don't know wheather he _______( come) tomorrow.
If he______( come), I'll tell you．
10 We will go to the park unless it _______ ( rain )
11If he ___in half an hour,we ___wait for him.
A.won't come ,won't B.won't come ,don'tC.doesn't come ,won'tD.will come ,don't 12如果他考试不及格,他的母亲会难过的.
His mother____ ____ ____ if he ____ pass the exam.
13如果他明天起床不够早的话,就不能赶上早班车
If he ___ get up early ___,he ___ be able to catch the early bus.
141.If you _____ to the party, you’ll have a great time.
A. will go B. went C. go D. going
15. It will be a long time ____ Peter _____ his work.
A. since, has finished B. after, finishes C. when, will finish D. before, finishes. 16 What will father _____ us from Japan?A. take B. bring C. carry D. make
17. Weifang is famous ______ kites. A. for B. to C. on D. with
18． 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 19 – 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
20.—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
21. What will you do if you _____ to the old folk’s home visit?
A. go B. went C.going D. will go
22. If I eat ____ food, I’ll be very fat.
A. too many B. many too C. too much D. much too
23. I’ll give the book to him if he ___ here next Sunday.
A. will come B. comes C. is coming D. came
24. There ____an English film in our school tomorrow.
A. is going to have B. will have C. is going to be D. has
24. 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
25. When my mother returned last night, I ____ a book.
A. read B. am reading C. was reading D. am going to read
26.What ____ you ____ when it began to rain?
A. do, do B. were, doing C. are, doing D. did, do
27. I’ll wake you up when he ____back.
A. will B. is going to come C. comes D. come