if引导的条件状语从句总结+习题.doc

if引导的条件状语从句课本链接 If you do, youll be sorry. (Unit 5, Section A)定义 :if引导的条件状语从句表示假如从句的动作发生，主句的动作就（不）会发生。句子结构 if 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。放在句首时，从句后面要用逗号和主句隔开。如：Ill go to see you if I have time. 如果有时间，我就去看你。If it rains tomorrow, well stay at home. 如果明天下雨，我们就呆在家里。时态呼应 在复合句中： 当主句是一般现在时或是一般将来时时；（2）当主句是祈使句时；（3）当主句含有情态动词时，if引导的条件状语从句通常用一般现在时。用法例句 主句为一般将来时态，if从句用一般现在时态。（主将从现）We will stay at home if it rains tomorrow.如果明天下雨，我将要呆在家。 主句中含有情态动词，if从句用一般现在时态。（主情从现）如：may/might/can/could/must/should/would If you finish your homework, you can go home now.如果你做完了作业，你现在可以回家了。主句为祈使句，if从句用一般现在时态。（主祈从现）Dont jump into the river if you feel very hot.如果你感到很热，不要跳入河里。主句为一般现在时时态，if从句用一般现在时态。（主现从现）Its dangerous if you play with the knife.玩儿刀是危险的。如：If she doesnt come, she will be sorry. 如果她不来，她会遗憾的。Have a good rest if you are tired. 如果累了，你就好好休息一下。We must study hard if we want to pass the final exam. 如果想通过期末考试，我们必须努力学习。同义句转换 1. 用“祈使句 and / or 一般将来时的句子”转换。如：If you work hard, youll pass the exam easily. Work hard, and youll pass the exam easily. 努力学习，你将很容易通过考试。If you dont hurry up, youll miss the train. Hurry up, or youll miss the train. 快点儿，否则你就赶不上火车了。 2. 用含介词with或without的介词短语转换。如：If there is no water, fish cant live. Fish cant live without water. 离开水，鱼不能生存。【边学边做】1. If there_ no buying and selling of animals, there_ no killing in nature.A. is; will he B. will be; will beC. is; is D. will be; is2. The students _ have a sports meeting this weekend if it _.A. wont; rainsB. will; rains C. wont; will rainD. are going to; is going to rain3. If you _ to the party, youll have a great time. A. will go B. went C. go D. going4.-What are you going to do tomorrow? -Well go to the library tomorrow if it _. A. isnt rain B. rain C. wont rain D. doesnt rain5. If I eat _ food, Ill be very fat. A. too many B. many too C. too much D. much too6. Ill give the book to him if he _ here next Sunday.A. will come B. comes C. is coming D. came7. Your teacher will be unhappy if you _ to school late.A. come B. will come C. are coming D. came 8. I dont know if he _. If he _, please let me know.A. comes, comes B. will come, will comeC. will come, comes D. comes, will come9. If she _ here tomorrow, I will tell you.A. comesB. will come C. come D. came10. Tom wants to know if you will have a picnic tomorrow. Yes. But if it _, well play chess instead.A. will rain B. rained C. is raining D. rains11. If Tom _ the game, well give him a surprise.A. win B. wins C. wonD. miming二、用所给词的适当形式填空。1. What will you buy if you _（have）a lot of money?2. If it _（not snow）tomorrow, we will feel unhappy.3. You mustnt go to school if you _（be）still in bed.4. If he _（be）at home at that time, he would know it.5. Please show me the way if you _（know）it.6. You will hurt your teeth if you _（eat）too much candy.7. If you gave me a toy car, I _（be）very happy.8. I wo