if引导的条件状语从句(讲义及答案)

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,

2、 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 b

3、ring 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

4、。但是如果放在主句前，即句首时，从句后面要用 隔开。与 主 句第 1 页you 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。 主将从现if you practice speaking english more, you will like it better. if she goes to new york tomorrow, i will go there,

5、 too.my sister will be very happy if our uncle comes next week.练习：if nancystudy.the exam, she will go to australia for englisha. passif the weatherweekend.b. passedfine, wec. passes d. will pass have a sports meeting nexta. will be; will b. is; willc. was; would d. was; will主情从现if you get up at six

6、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 doesnt rain tomorrow. ifyou 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”unlesshe comes here in an hour, i will go there alone. if h

7、edoesnt 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. because c. although d. ifplease give alice the

8、story book all right.a. unless b. oryou see her.c. but d. if第 2 页exercises一、单项选择( )1. studying in groups is necessary in school.you want to do wella. ifb. until c. unless d. though()2. will you help me with the trouble? i wonta. if( )3. if bobhealth.you tell me the truth.b. but c. after d. unless aw

9、ay from the junk food, he will be in gooda. stayb. will stayc. staysd. stayed()4. if tomthe game, well give him a surprise.(a. winb. wins)5. well go to the park if itc. wontomorrow.d. winning(a. wont rain b. dont rain )6. if youre more careful, youc. doesnt rain d. rain much better.a. dob. will doc.

10、 are doingd. did()7. if thereno buying and selling of animals, thereno killing in nature.a. is; will bec. is; isb. will be; will be d. will be; is()8. im waiting for my friend. if he swimming alone., ia. doesnt come; go c. wont come; will go二、翻译b. wont come; god. doesnt come; will go如果明天不下雨，我会去看你的。9.if it tomorrow, i10. 如果 mary 不为考试做准备，她会不及格。 if marythe exam, sheexam.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。you.fail the第 3 页【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：c bunless练习：a dexercises一、单项选择1-5 adcbc6-8 bad二、翻译9. doesnt r