精品资料欢迎下载初中英语：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。在英语中由连接词if 或 unless 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，通常译作“ 假如，只要，如果” 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 let him down 如果你考试不及格，你会让他失望的。2.unless conj. 除非 ,若不 ,除非在 的时候（ if .not. ）You will fail to arrive there in time unless you start earlier. 如果你不早点动身,你就不能及时赶到那儿。Unless it rains, 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 clean. 只要你保持书的清洁，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 ll be a nurse and look after patients. 我长大后要当一名护士，照顾病人。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 when you are in the reading room. 在阅览室时应保持安静。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 news when 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 returns. 她一回来就会给你电话。2.If 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 work 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 t hurry up.you will be late.如果你不快点， 你就要迟到了。精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 1 页，共 4 页精品资料欢迎下载条件状语从句练习精讲（含答案）.单项选择1. If you _ to the party, you ll have a great time. A. will go B. went C. go D. going 2. It will be a long time _ Peter _ his work. A. since, has finished B. after, finishes C. when, will finish D. before, finishes. 3. What will father _ us from Japan? A. take B. bring C. carry D. make 4. Weifang is famous _ kites A. for B. to C. on D. with 5 I _ her the answer if she _me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks 6. What are you going to do tomorrow? -We ll go to the library tomorrow if it _. A. isn t rainB. rain C. won t rainD. doesn t rain7. Do you know when he will come back tomorrow? -Sorry, I don t know. When he _ back, I ll tell you. A. comes B. will come C. come D. may come 8. What will you do if you _ to the old folk s home visit?A. go B. went C. going D. will go 9. If I eat _ food, I ll be very fat.A. too many B. many too C. too much D. much too 10. I ll give the book to him if he _ here next Sunday.A. will come B. comes C. is coming D. came 11. There _an English film in our school tomorrow. A. is going to have B. will have C. is going to be D. has 12. Could you tell us where _ ？A. will the next Olympic Games held B. the next Olympic Games will be held C. would the next Olympic Games be held D. the next Olympic Games would be held 13. When my mother returned last night, I _ a book. A. read B. am reading C. was reading D. am going to read 14. What _ you _ when it began to rain? A. do, do B. were, doing C. are, doing D. did, do 15. I ll wake you up when he _back.A. will B. is going to come C. comes D. come Answers：1-5 CDBAD 6-10 DAACB 11-15 CBCBC 二、用所给词的适当形式填空1. If you _(feel) tired, you _ (have) to have a rest. 2. Where _ he _(see) the film if he _(have) time? 3. If there _ (be) fewer trees, there _ (be) more pollution. 4. He _ (dress) more casually if he _ (not work) on weekends. 5. If Marcia _ (live) alone, she _ (keep) a pet parrot. 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 2 页，共 4 页精品资料欢迎下载6. Lana _ (buy) a new dress if the old one _ (be) out of style. 7. The twins _ (fight) if they_ (argue). 8. I _ (have) a bake sale if I _ (need) money for education. 9. Peter _ (send) me a beautiful souvenir if he _(visit) Spain. 10. If Mr. Green _ (say) I am hard- working, my parents _ (feel) glad. 11. I _ (go) to the beach if it_ (not rain) this week. 12. _they _ (have) a match if the P.E. teacher _ (be) busy? 13. He _ (write) a letter to his grandparents if he _ (get) his report card this week. 14. If she _ (get) up late, she _ (not catch) the early bus. 15. Peter _ (major) in English if he _(pass) the exams in Peking University. Answers：1 feel，will have 2 will see has 3 are, will be 4 will dresses, doesn t work 5 lives, will keep 6 will buy, is 7 will fight, argue 8 will have, need 9 will send, visits 10 says, will feel 11 will go, doesn t rain12 Will have is 13 will writes, gets 14 gets, won t 15 will major, passes III 完成句子1.如果他到得晚了，会发生什么事情？What _ if he _ late? 2. 如果努力学习， 你就会取得好成绩。If you_ _, you _ good _. 3. 他如果看电视太久了，他的父母会不高兴。 If he _ TV too long, his parents _ _unhappy. 4. 如果我们为他组织生日聚会，大家都会来的。Everyone _ if we _a birthday party _ him. 5. 如果明天不下雨，我会和你一起去公园的。If it _ _tomorrow, I _ go to the park _you. 6. 如果她睡过头了，就会上学迟到的。 She _ _ _ _ if she _ _ 7. 如果他没有空，他不会帮助你的。If he _ _, he _ _ you. 8. 如果 Tom 考试不及格，他就没有机会上高中了。Tom _have the _to go to the high school if he _the exams. 9. 如果这个男孩打烂窗户，屋主会对他生气。If the boy_ _ _, the house owner _ _ _ _ _. 10. 如果明天不下雨，我就出去野餐。_ Answers 1. was happened ， came late? 2 work hard, will get ， success. 3. watch, will be 4 will come, hold, for 5 doesn t rain, will, with 6 will be late for school, sleeps late 7 isn t free, won t help 8 won t chance fails 9 breaks the window , will be angry at him 10. If it doesn t rain tomorrow, I will go out to have a picnic.精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 3 页，共 4 页精品资料欢迎下载1.If you feel tired, you should have to have a rest. 2. Where has he seen the film if he has time? 3. If there are fewer trees, there will be more pollution. 4. He will dress more casually if he doesn t work on weekends.5. If Marcia lives alone, she should keep) a pet parrot. 6. Lana should buy a new dress if the old one is out of style. 7.The twins will fight if they argue. 8. I will have a bake sale if I need money for education. 9. Peter will send me a beautiful souvenir if he tours Spain. 10. If Mr Green says I am hard- working, my parents will feel glad. 11.I will go to the beach if it doesn t rain this week.12. Will they have a match if the P.E. teacher is busy? 13.He will write a letter to his grandparents if he gets his report card this week. 14. If she gets up late, she won t catch the early bus. 15. Peter will major in English if he passes the exams in Peking University. Translate 1.如果他到得晚了会发生什么事情？2. 如果努力学习，你就会取得好成绩。3. 他如果看电视太久了，他的父母会不高兴。4. 如果我们为他组织生日聚会，大家都会来的。5. 如果明天不下雨，我会和你一起去公园的。6. 如果她睡过头了，就会旅游迟到的。7. 如果他有空，他会帮助你的。8. 如果 Tom 考试不及格，他就没有机会上高中了。9. 如果她不努力学习，不能学好各门功课。10.如果这个男孩打烂窗户，屋主会对他生气。1.What will happen if he comes late? 2.If you work hard, you will get good marks. 3.If he watches TV too long, his parents will be unhappy. 4.Everyone will come if we hold a birthday party for him. 5.If it doesnt rain tomorrow, I will go to the park with you. 6.He will lose chance to the trip if she sleeps over. 7.If he has time, he will help you. 8.Tom won t have the chance to go to the high school if he fails the exams.9.She won t be good at all the subjects if doesn t study hard.10.If the boy breaks the window, the house owner will be angry at him. 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 4 页，共 4 页