U10语法条件状语从句

1、Grammar for Unit 10条件状语从句一、定义： 状语从句：在复合句中，由从句表示的状语叫做状语从句，在句子中起副词作用。 条件状语从句：由引导词 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（状语从句中的动作） ，其它事情（主句中的动作）才能发生。注意： 在含有条件状语从句的复合句中， 表示将来时态， 主句是一般将来时态（或表示 将来含义的） ，从句要用一般现在时、祈使句或情态动词主将从现原则 。二、类型：1. 由 if 引导的条件状语从句：表示在某种条件下某事很可能发生。如： If you ask him, he will help y

2、ou. 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。 if 引导的条件状语从句既可以将从句放前面也可以将从句放后面If it rains, we will stop playing. / We will stop playing if it rains. 如果天下雨，我们就不玩了。2. uni ess conj.除非，若不，除非在的时候You will fail to arrive there in time unless you start earlier.如果你不早点动身，你就

3、不能及时赶到那儿。Uniess it rains, the game wiii be piayed. 除非下雨，比赛将照常进行。3. as / so iong as 只要So iong as you're happy, it doesn't matter what you do.只要你高兴，你做什么都没有关系。You may borrow my book as iong as you keep it ciean. 只要你保持书的清洁，你就可以把我的书借去。*4. in case 万一、以防、如果 Take your umbreiia in case it rains. 带着你的

4、伞吧，以防下雨。In case you need something, piease don't hesitate to iet me know. 万一你需要什么东西，请不客气地对我说。*5. on condition（that）.在条件下，从句是主句事件发生的前提条件或唯一条件。 I can teii you the truth on condition that you promise to keep a secret.我可以告诉你真相，条件是你答应保密。*6. supposing conj. 如果，假如 Supposing it rains, shaii we continue

5、the sports meeting? 倘若下雨，我们的运动会还要继续举行吗 ?*7. provided conj. 假如，除非，以 为条件 provided （that） + 从句 He won't be against us in the meeting provided that we ask for his advice in advance. 如果我们提前征求一下他的意见，他就不会在会上反对我们。三、条件状语从句中的省略：Come tomorrow if possibie. 可能的话，明天来。I wiii go instead of him if necessary. 有必要

6、的话我会代替他去。四、条件状语从句在虚拟语气中的使用：If I were you, I wouid invite him to the party. 如果我是你，我会邀请他参加聚会。I wouid have arrived much eariier if I had not been caught in the traffic. 如果没有堵车，我会到的早一点儿。练习：I. 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

7、 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.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

8、 education.9. Peter (send) me a beautiful souvenir if he (tour) 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

9、 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.二、根据汉语意思完成句子：1. 如果他到晚了会发生什么事情？What if he ?2. 如果努力学习，你就会取得好成绩。If you, you .3. 他如果看电视太久了，他的父母会不高兴。If he , his parents .4. 如果我们为他组织生日聚会，大家都会来的。Everyone

10、 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，就会旅游迟到的。She the trip if she .7. 如果他有空，他会帮助你的。If he , he you.8. 如果 Tom 考试不及格，他就没有机会上高中了。Tom to go to high school if he the exams.9. 你如果抄同学的作业就不能学好各门功课。You all the subjects if you homework.10. 如果你不原谅他，他会很

11、伤心的。 you , he .、单项选择_ to the party, youB. wenther the answer if she' ll have a great time. C. go me.) 1. If you A. will go ) 2. I A. can tell, will ask B. will tell, will ask C. would tell, ask ) 3. - What are you going to do tomorrow?-We' ll go to the library tomorrow if it _ .A. isn '

12、t rain B. rain ) 4. Frank a film if heA. will seeB. saw) 5. Difficulties are nothing if we A. willB. shallD. goingD. will tell, asksC. won ' t rain 's free next Saturday.C. has seen not afraid of them C. areD. doesn ' t rainD. seeD. do) 6. We Beijing to morrow if it doesn' t rain.A.

13、are going to B. would C. shall ) 7. I 'llgo to meet you, if I free then.A. would be ) 8. I don ' A. speakD. will go) 9. There is going to A. be; will rainB. will beC. amt like to be interrupted _if_I.B. will speakC. am speakinga sports meeting next week. If it B. have; will rainD. wasD. spok

14、e , well have to cancelC. be; rainsD. give; is going to rain( ) 10. Be careful, if you want to make mistakes.A. won ' tB. don ' tC. didn ' t D. not( ) 11. Work hard if you to get a good mark.A. wantedB. wantingC. want D. will want( ) 12. If you a chance to study in a foreign country, jus

15、t take it.A. getting B. had gotC. will getD. get( ) 13. -I want to know if you_ to the party tomorrow.-I will if IA. will come; amB. come; amfree.C. will come; will beD. come; will be( ) 14. You'll miss the train you hurry up.A. unlessB. as C. if D. until( ) 15. If he , I go swimming alone.A. doesn ' t co;mweill goB. won ' t come; will goC. will come; won ' t goD. is coming; don ' t go( ) 16. -Do you know when he back tomorrow?-Sorry, I don' t know. If_h_e back, I ' ll tell you.A. comes, may come B. w