条件状语从句

1、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。W

2、hat would happen if there were no water 如果没有水会怎样 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。/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。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

3、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，

4、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 .( ) it sunny tomorrow, I boating.a. is gob. will be, go c. is, will go d. will be, will go( ) 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 Ru

5、n fast, or you ll be l'ate 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

6、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.'t come ,won't 't come ,don''t come ,won' come ,don't 12 如果他考试不及格 ,他的母亲会难过的His moth

7、er 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.you to the party, you' ll have a great time.A. will go B. went C. go D. going15. It will be a long time Peter his work.A. since, has finished B. after, finishesC. when, will finishD. before

8、, finishes.16 What will father us from JapanA. takeB. bring C. carry D. make17. Weifang is famous kites. A. forB. to C. on D. with18 I her the answer if she me.A. can tell, will askB. will tell, will asktell, ask D. will tell, asks19 What are you going to do tomorrow-We' ll go to the library tom

9、orrow if it .A. isn ' t raiBn . rain C. won ' t rainD . doesn ' t rain20. 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 come21. What will you do if you to the old folk's home visitA. go B. wen

10、t D. will go22. If I eat food, I ' ll be very fat.A. too many B. many too C. too much D. much too23. I 'll give the book to him if he _ here next Sunday.A. will come B. comes C. is comingD. came24. There an English film in our school tomorrow.A. is going to have B. will have C. is going to be D. has24. Could you tell us where A. will the next Olympic Games held B. the next Olympic Games will be heldC. would the next Olympic Games be held D. the next Olympic Games would be held25. When my mother returned last night, I a book.A. readB. am reading C. was reading D. am