1、xx一條件狀語從句一條件狀語從句的概念條件狀語從句，即在某種條件下，一件事情可能發生。在英語中由連接詞if或unless等引導的狀語從句叫做條件狀語從句。條件是指某一件事情實現之后（狀語從句中），一件事情（主句）才能發生，通常譯作“假如，只要，如果”等意思。條件狀語從句中，主從句的時態要遵循“主將從現”的原則。即，主句是將來時態時，從句用一般現在時代替將來時態。二 .條件狀語從句的引導詞1.If conj . 如果，假如If you ask him, he will help you.如果你請他幫忙，他會幫你的。If you fail in the exam， you will let him

2、 down 如果你考試不及格，你會讓他失望的。2.unless conj除非,若不,除非在的時候 （if .not.）You will fail to arrive there in time unless you start earlier.如果你不早點動身,你就不能及時趕到那兒。Unless it rains, the game will be played除非下雨，比賽將照常進行。3.so/as long as conj 只要You may borrow my book as long as you keep it clean.只要你保持書的清潔，你就可以把我的書借去。三關于條件句的時態

3、，常見的有以下三種情況：1、 條件狀語從句的主句是一般將來時，那么從句常常用一般現在時。When I grow up, I'll be a nurse and look after patients. 1 / 6我長大后要當一名護士，照顧病人。2、如果主句是祈使句，那么從句通常要用一般現在時。If you want to have a chat ,call me up.如果你想聊天，打我電話。3、如果主句是含有情態動詞時，根據需要從句多用一般現在時。You should be quiet when you are in the reading room.在閱覽室時應保持安靜。四知識拓展

4、當她回來的時候，我將把這個好消息告訴她。she will give you a call as soon as she returns.她一回來就會給你電話。2.If條件句的同義句：祈使句，and /or+將來時態的陳述句。Work hard ,and you will make great progress.=If you work hard,you will make great progress.如果你努力學習，你才會取得大的進步。Hurry up, or you will be late.=If you don't hurry up.you will be late. 如果你不

5、快點，你就要遲到了。條件狀語從句的時態練習一、用所給詞的適當形式填空1 .When i (feel) tired, i (have) t a rest.2 / 62. Where he (see) the film if he(have)time?3. Unless there (be) many trees, there ( be)morepollution.4. He (dress) more casually unless he work) on weekends.5. If Marcia (live) alone, she( keep) a petparrot.6. Lana ( bu

6、y) a new dress as soon as the old one(be) out of style.7. The twins (fight) when they(argue).8. I (have) a bake sale if I (need) money foreducation.9. Peter ( send) me a beautiful souvenir as long as he(tour) Spain.10. As long as Mr Green (say) I am ha-rdworking, myparents( feel) glad.11. I (go) to

7、the beach if it( not rain)this week.12. they ( have) a match if the.EP. teacher(be) busy?13. He (write) a letter to his grandparentsas long as he (be )free oftask.14. Unless she (get) up late, she (catch)theearly bus.15. Peter (major) in English if he (pass) the exams inPeking University.3 / 615. 如果

8、他到的晚了會發生什么事情？What if helate?16. 如果努力學習，你就會取得好成績。If you, you good .17. 他如果不看電視了，他的父母會很高興。Unless he TV too much, his parents veryhappy.18. 如果我們為他組織生日聚會，大家都會來的。Everyone if we a birthday partyhim.19. 除非明天下雨，否則我將和你一起去公園的。Unless it tomorrow, I go tothe park you. 20. 如果她睡過頭了，就會旅游遲到的。 She;the trip if she21.

9、 只要他有空，他會幫助你的。As long as he , he you.22. 如果 Tom 考試不及格，他就沒有機會上高中了。Tom have the to go to the high school ifhe the exams.23. 你如果抄同學的作業就不能學好各門功課。You good at every subjects if you the otherstudents' homework. 4 / 6二、單項選擇（15 分）1.1 f you to the party, you'll have a great time. A. will go B. wentC.g

10、o D. going2. It will be a long time Peter his work.A. since, has finished B. after, finishes C. when, will finish D. before, finishes.4.If wangfang me,me at once.A.need,tell B.needs,telling C.need,telling D.needs,tell5 I her the answer if she me.A. can tell, will ask B. will tell, will ask C. would

11、tell, ask D. will tell, asks6 - What are you going to do tomorrow?-We'll go to the library tomorrow if it _.A. isn't rain B. rain C. won't rain D. doesn't rain-Sorry, I don't know. When he back, I'll tell you.8. What will you do if you to the old folk's home visit?A. go B

12、. went C.going D. will go9. I eat much food, I'll be very fat.A. Although B. if C. while D. becauseA. if B. as long as C. though D. unless11. There an English film in our school tomorrow.A. is going to have B. will have C. is going to be D. has12. Could you tell us where ？5 / 6A. will the next Olympic Games heldB. the next Olympic Games will be heldC. would the next Olympic Games be heldD. the next Olympic Games would be held13. When my mother returned l