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1、if 引导的条件状语从句（讲义）状语用来表示行为发生的时间、地点、目的、方式、程度等，通常由副词或介词短语充当，也可由一个句子充当。I slept at home yesterday because I had a bad cold.状语从句状语从句指句子作状语。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式等从句。状语从句一般由连词(从属连词)引导。I will go to school by bike tomorrow if it is sunny.Grammar focusI think Ill take the bus to the party.If you do, y
2、oull be late.If you take the bus to the party, youll be late.I think Ill stay at home.If you do, youll be sorry.If you stay at home, youll be sorry.What will happen if they have the party today?If they have it today, half the class wont come.Should we ask people to bring food?If we ask people to bri
3、ng food, theyll just bring potato chips and chocolate.1. if 在本单元句中意为“ ； ” ，用于引导 。即 if 引导的是一个完整的句子，所以一定要有主谓，成为从句，另一个句子则成为主句。If you go there, Ill go, too.We will go hiking if it doesnt rain tomorrow.If Bob leaves tomorrow, I will hold a party for him tonight.2. if 引导的条件状语从句既可以放在主句前，也可放在主句后。但是如果放在主句前，即
4、句首时，从句后面要用 与主句隔开。在校园的时候曾经梦想去桂林，到那山水甲天下的阳朔仙境，漓江的水呀常在我心里流，去那美丽的地方是我一生的期望，有位老爷爷他退休有钱有时间，他给我描绘了那幅美妙画卷，刘三姐的歌声和动人的传说，亲临其境是老爷爷一生的心愿，我想去桂林呀，我想去桂林，可是有时间的时候我却没有钱，我想去桂林呀，我想去桂林，可是有了钱的时候我却没时间3You will keep healthy if you do more exercise. If you do more exercise, you will keep healthy.3. 时态：if 引导的条件状语从句用 表示将来，主句
5、可以使用一般将来时，含有情态动词的句子或者祈使句。主将从现If you practice speaking English more, you will like it better. If she goes to New York tomorrow, I will go there, too.My sister will be very happy if our uncle comes next week.练习：If Nancythe exam, she will go to Australia for English study.A. passB. passedC. passesD. wi
6、ll pass If the weather fine, we have a sports meeting next weekend.A. will be; will B. is; willC. was; would D. was; will主情从现If you get up at six tomorrow morning, you can catch the first bus. If you go to study in America next year, you must learn English hard.主祈从现Lets go out for a walk if it doesn
7、t rain tomorrow. If you see a snake in the forest, dont move!unless也可引导条件状语从句，表示“如果不，除非” Unless he comes here in an hour, I will go there alone. If he doesnt come here in an hour, I will go there alone.You will feel worse unless you go to see the doctor right now. You will feel worse if you dont go
8、to see the doctor right now. 练习： you read it, you cant imagine how interesting the story is.A. UnlessB. BecauseC. AlthoughD. IfPlease give Alice the story book you see her.All right.A. unlessB. orC. butD. ifExercises一、单项选择()1. Studying in groups is necessary you want to do well in school.A. ifB. unt
9、ilC. unlessD. though ()2. Will you help me with the trouble?I wont you tell me the truth.A. ifB. butC. afterD. unless()3. If Bob away from the junk food, he will be in good health.A. stayB. will stayC. staysD. stayed ()4. If Tom the game, well give him a surprise.A. winB. winsC. wonD. winning ()5. W
10、ell go to the park if it tomorrow.A. wont rainB. dont rainC. doesnt rainD. rain ()6. If youre more careful, you much better.A. doB. will doC. are doingD. did()7. If thereno buying and selling of animals, there no killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is()8. Im waiti
11、ng for my friend. If he , I swimming alone.A. doesnt come; goB. wont come; goC. wont come; will goD. doesnt come; will go二、翻译9. 如果明天不下雨，我会去看你的。If it tomorrow, I you.10. 如果 Mary 不为考试做准备，她会不及格。If Mary the exam, she fail the exam.11. 如果你不告诉我原因，我会告诉妈妈这件事。12. 我不会去医院的，除非你和我一起去那儿。【参考答案】Grammar focus1. 如果；假如；条件状语从句2. 逗号3. 一般现在时主将从现练习：CBunless 练习： ADExercises一、单项选择1-5 ADCBC6-8 BAD二、翻译9. doesnt rain; will visit10. doesnt prepare for; will11. If you dont tell me the reason, I will tell mom this thing.12. I wont go to the hospital unless you go there with me.4
