If-用法匯總及練習(xí)(共6頁)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上If 用法匯總1、主將從現(xiàn) （主句為一般將來時,從句為一般現(xiàn)在時）；eg:If it rains(從句) ,I will stay at home（主句）.=I will stay at home if it rains.2、主句含有情態(tài)動詞 （must、may、can etc.）從句為一般現(xiàn)在時；eg:If you drive too fast ,you may have an accident.=You may have an accident if you drive too fast3、主句為祈使句,從句要用一般現(xiàn)在時態(tài)；eg:Don't play c

2、omputer games if you don't finish your homework.4、 是否=whetherAsk if he is at home. I wonder if she is ill.5、 虛擬語氣 eg:If I were a bird ,I would fly in the sky.（事實(shí)我不可能是鳥）時態(tài)：可以表示過去，現(xiàn)在和將來的情況，它的基本特點(diǎn)是時態(tài)退后.a.同現(xiàn)在事實(shí)相反的假設(shè)從句用一般過去時 should( would) +動詞原形If they were here,they would help you.b.表示于過去事實(shí)相反的假設(shè)從句用過

3、去完成時 should(would) have+ 過去分詞If she had worked harder,she would have succeeded.If my lawyer had been here last Saturday,he would have prevented me from going.c.表示對將來的假想一般過去時 ，were+ to do， 從句：主+ should/would/could/might+v原形should+ v原形，If you succeeded,everything would be all right.If you were to succ

4、eed,everything would be all right.If you should succeed,everything would be all right.單項練習(xí)（每個必須讓學(xué)生翻譯）1. If I _ where he lived, I _ a note to him.A. know, would have sentB. had known, would have sentC. know, would send D. knew, would have sent2. Mary is ill today. If she _, she _ absent from school.A

5、. were not ill; wouldnt be B. had been ill; wouldnt have beenC. had been ill; should have been D. hadnt been ill; could be3. He acted as if he _ everything in the world.A. knew B. knows C. has known D. won't know4. If you had enough money, what _?A. will you buy B. would you buyC. would you have

6、 boughtD. will you have bought5. If Mr. Young _ with justice, he _ such a wrong thing.A. were treated; wouldnt doB. had been treated; wouldnt have doneC. were treated; wouldnt have doneD. had been treated; wouldnt do6. What _ if there _ no light during the day?A. will happen; wasB. would happen; isC

7、. happens; were D. would happen; were7. The spokesman acted that way as if he _ anything about the accident but actually he did.A. doesnt hear B. didnt hear C. havent heard D. hadnt heard8. If it _ not for the fact that you _ ill now, I would surely punish you.A. is; are B. were; were C. were; are D

8、. was; were9. Many Chinese movie stars now have given up their Chinese nationality. If I were them,I _ that.A. shouldnt do B. didnt do C. hadnt done D. wont do10. I want to get back by 5 oclock if _.A. likely B. can C. possible D. Probable11. It seems as if it _ already summer now but it is only Feb

9、ruary.A. is B. was C. were D. had been12. If Henry had not pulled his cap low over his brow, he _ by the police.A. might be recognized B. might have been recognizedC. would have recognized D. was to have been recognized13. There is a ring at the door. That _ be the postman, I suppose.A. will B. woul

10、dC. is going toD. was going to14. Look at the dark cloudsthere _ be a storm.A. will B. must have beenC. is going toD. would15. Why are you taking the pictures down?I _ the wall.A. paint B. have just paintedC. am going to paint D. will have painted16. Can I stay at home tomorrow?Yes, you can if it_.A

11、. will snow B. is going to snowC. snows D. snowed17. I dont know if he _ this afternoon. But if he _, I will tell you.A. will come; will do; B. comes; will doC. will come; does D. comes; does18. I thought I asked you to fix the radio.Oh, Im sorry. I _ it right away.A. am to do B. will doC. was about

12、 to doD. am going to do19. The WTO cant live up to its name _ it does not include a country that is home to one fifth of mankind.A. as long as B. whether C. if D. even though20. Ask him to ring me up if you _ him.A. see B. saw C. would see D. will see21. Its so late. I dont think he _ come.A. would

13、B. should C. is going to D. shall22. If people _ polluting the air, animals and plants will die soon.A. dont stop B. didnt stopC. shall not stopD. havent stopped23. If you _ an interesting day out, _ the Science Museum.A. want; visiting B. want; visitC. want to; visit D. wanting; visit24. If the pur

14、e water is heated to 100 centigrade degrees, it _ boil.A. is going to B. will C. would D. is to25. Is a dictionary available, _ so, where?A. if B. if is C. and if D. and if is15 BAABB 610 DDCAC 1115 CBACC 1620 CCBCA 2125 CABBC最后一練1.If you _ to the party, youll have a great time. A. will go  B.

15、went  C. go   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.3. What will father _ us from Japan? A. take   B. bring   C. carry  

16、 D. make 4. Weifang is famous _ kites. A. for   B. to   C. on   D. with5 I _ her the answer if she _me. A. can tell, will ask   B. will tell, will ask  C. would tell, ask   D. will tell, asks6. What are you going to do tomorrow? -Well go to

17、 the library tomorrow if it _. A. isnt rain  B. rain   C. wont rain  D. doesnt rain7.Do you know when he will come back tomorrow?-Sorry, I dont know. When he _ back, Ill tell you. A. comes  B. will come   C. come   D. may come 8. What will you do if you _

18、 to the old folks home visit?A. go   B. went   C.going   D. will go9. If I eat _ food, Ill be very fat.A. too many   B. many too   C. too much  D. much too10. Ill give the book to him if he _ here next Sunday.A. will come   B. comes   C. is coming    D. came11. 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