2019年八年级英语上册if引导的条件状语从句讲义（新版）人教新目标版.doc
1ifif 引导的条件状语从句（讲义）引导的条件状语从句（讲义）状语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.GrammarGrammar focusfocusI think Ill take the bus to the party.If you do, youll 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 bring food, theyll just bring potato chips and chocolate. 1if 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. 2if 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， 即句首时， 从句后面要用 与主句隔开。2You 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。主将从主将从现现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. will 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.主祈从现主祈从现Lets go out for a walk if it doesnt rain tomorrow. If you see a snake in the forest, dont move!unlessunless 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 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.3A.unlessB. orC. butD. if4ExercisesExercises一、单项选择一、单项选择()1. Studying in groups is necessary you want to do well in school.A.ifB. untilC. 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. Well go to the park if it tomorrow.A. wont rain B. 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, thereno killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is()8. Im waiting 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。【参考答案参考答案】GrammarGrammar focusfocus1.如果；假如；条件状语从句 2.逗号 3.一般现在时 主将从现主将从现练习：CBunlessunless 练习： ADExercisesExercises一、单项选择一、单项选择1-5 ADCBC6-8 BAD 二、翻译二、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
