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1、初中英语一条件状语从句一条件状语从句的概念条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连词 if或uni ess等引导的状语从句叫做条件状语从句。条件是指某一件事情实现之后（状语从句中）一件事情（主句）才能发生，通常讲假如，只要，如 果II等意思。条件状语从句中，主从句的时态 要遵循 主将从现”的原则。即，主句是将来时态时，从句用一般现在时代替将来时 态。二.条件状语从句的引导词1.If conj .如果，假如If you ask him , he will help you .如果你请他帮忙，他会帮你的。If you fail in the exam , you will le
2、t him down如果你考试不及格，你会让他失望的。2. u nless conj.除非 若不，除非在 ？ ？ 的时候if . no t.）You w ill fail to arrive there in time uni ess you start earlier.如果你不早点动除就不能及时赶到那儿。Un less it rai ns, the game will be played. 除非 下雨,比赛将照常进行3. so/as long as conj. 只 要You may borrow my book as long as you keep it clea n.只要你保持书的清洁，
3、你就可以把我的书借去。三关 于条件句的时态 ,常见的有以下三种情况：1、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。When I grow up, I be a nurse and look after patients.我长大后要当一名护士，照顾病。2、如果主句是祈使句，那么从句通常要用一般现在时。If you want to have a chat ,call me up.如果你想聊天，打我电话。3、如果主句是含有情态动词时，根据需要从句多用一般现在时。You should be quiet whe n you are in the read ing room.在阅览室时应保
4、持安静。四知识拓展1在以when , before , as soon as等引导的时间状语从句，也适用“主将从现”原则，即如果主句是一般将来时，从句则用一般现在时。Ill tell her the good n ews whe n she comes back.当她回来的时候，我将把这个好消息告诉她。she will give you a call as soon as she retur ns.她一回来就会给你电话。4.lf条件句的同义句：祈使句，and /or+将来时态的陈述句。Work hard ,and you will make great progress.=If you wor
5、k hard,you will make great progress.如果你努力学习，你才会取得大的进步。Hurry up, or you will be late.=If you don hurry up.you will be late.如果你不快点，你就要迟到了。条件状语从句的时态练习一、用所给词的适当形式填空1. Whe n i(feel) tired, i(have) t a rest.2. Wherehe(see) the film if he(have) time?3. U nless there(be) many trees, there( be) more polluti
6、on.4. He(dress) more casually uni ess hework) on weeke nds.5. If Marcia(live) alone, she( keep) a pet parrot.6. Lana( buy) a new dress as soon as the old one(be) out of style.7. The twi ns(fight) whe n they(argue).5. I(have) a bake sale if I(n eed) money for educati on.6. Peter( send) me a beautiful
7、 souve nir as long as he(tour) Spa in.7. As long as Mr Gree n(say) I am hard- work ing, my pare nts( feel) glad.8.1(go) to the beach if it( not rai n) this week.9. they( have) a match if the P .E. teacher(be) busy?10. He(write) a letter to his gran dpare ntsas long ashe(be ) free of task.11. Uni ess
8、she(get) up late, she(catch) the early bus.12. Peter(major) in En glish if he(pass) the exams in PekingUn iversity.8. 如果他到的晚了会发生什么事情？Whatif helate?9. 如果努力学习，你就会取得好成绩。If you, yougood.10. 他如果不看电视了，他的父母会很高兴。Un lessheTV too much, his pare ntsvery happy.11. 如果我们为他组织生日聚会，大家都会来的。Every oneif wea birthday pa
9、rtyhim.12. 除非明天下雨，否则我将和你一起去公园的。Un less it tomorrow, Igo to the parkyou.13. 如果她睡过头了，就会旅游迟到的。She;the trip if she.14. 只要他有空，他会帮助你的。As long as he, heyou.15. 如果Tom考试不及格，他就没有机会上高中了。Tomhave theto go to thehigh school if hethe exams.16. 你如果抄同学的作业就不能学好各门功课。Yougood at every subjects if youthe other stude nts
10、homework.二、单项选择(15分)1.If youto the part y, you ll have a great time. A. will go B. went C. go D. going2. It will be a long timePeterhis work.A. sin ce, has fini shedB. after, fini shes C. whe n, will finish D. before, fini shes.3. What will fatherbri ng us,he comes from Chin a.A. ifB.whe n C. as lon
11、g asD.un till13. If wangfangme,me at once.A.n eed,tell B.n eeds,telli ng C.n eed,telli ng D.n eeds,tell5 . Iher the answer if sheme.A. can tell, will askB. will tell, will askC. would tell, ask D. will tell, asks17. -What are you going to do tomorrow?-We l go to the library tomorrow if it.A. is nrai
12、B n. rain C. won ra inD. does nra in18. Do you know whe n he will come back tomorrow?-Sorry, I don t know. Whe n heback, Il tell you.A. comes B. will come C. come D. may come19. What will you do if youto the old folk home visit?A. go B. went C.goi ng D. will go20.I eat much food , Ibe very fat.A. Al
13、though B. if C. whileD. because21. I hl ot give the book to himhe will comehere n ext Sun day.A. if B. as long as C. though D. uni ess22. Therean En glish film in our school tomorrow.A. is going to have B. will have C. is going to be D. has23. Could you tell us where?A. will the next Olympic Games h
14、eldB. the next Olympic Games will be heldC. would the n ext Olympic Games be heldD. the n ext Olympic Games would be held24. Whe n my mother returned last ni ght, Ia book.A. read B. am read ing C. was read ingD. am going to read25. Whatyouwhe n it bega n to rain?A. do, do B. were, doing C. are, doing D. did, do26. I l wake you up whe n heback.A. willB. is going to comeC. comes D. come
