if条件句讲解及其练习进步

1、if条件句讲解及练习从句主句与现 在事 实相 反与过 去事 实相 反过去式（be用 were）would/should/could/might+ do过去完成 式would/should/could/might+ have done与将 来事 实相 反shouldwould/should/could/might(were to) + do+动词原形If I were you, I would not let out the secret.如果我是你的话，我不会泄露这个 秘密的。If I knew his new address, I would tell you.如果我知道他的新地址，我会告诉

2、 你的。If he studied harder, he would pass the exam.如果他学习再努力点的话，他会通 过考试的。If we had made fuller preparation, we should have won the game.如果我们做了更充分的准备的话， 我们肯定就赢了这场比赛。If you had taken my advice, you wouldn ' t havebeen late for the meeting.如果你听了我的建议，你开会就不 会迟到了。If she were to/should come, I would tell

3、her the secret.万一她来的话，我会告诉她这个秘 密。（2）省略 if 的虚拟条件句在含有 were, had, 或者 should 等 词的虚拟条件句中， 可以省略 if, 将 were, had 或者 should 这些助动词放在句首。 如：Were I you, I would not let out the secret.Had we made fuller preparation, we should have won the game.Had you taken my advice, youwouldn ' t have been late for the me

4、eting.Should she come, I would tell her the secret.高一语法练习（四）预测、 if 条件句及 虚拟语气一、单项选择1. If I where he lived, I a note to him.A. know, would have sentB. had known, would have sentC. know, would sendD. knew, would have sent 2. Mary is ill today. If shesheA. were not ill B. had been ill; wouldn C. hadD. h

5、adn absent from school.were not ill; wouldn 't be 't have been been ill; should have been ' t been ill; could be3.B. knows D. won't knowHe acted as if he everything in the world.A. knewC. has known4. If you had enough money, what _?A. will you buyB. would you buyC. would you have bou

6、ghtD. will you have bought5. If Mr. Young with justice,he such a wrong thing.A. were treated; wouldn 't doB. had been treated; wouldn h'avtedonet have't donoC. were treated; wouldn' doneD. had been treated; wouldn6. What if therelight during the day?A. will happen; wasB. would happen

7、; isC. happens; wereD. would happen; were7. The spokesman acted that way as if he anything about the accidentbut actually he did.A. doesn 't hearB. didn ' t hearC. haven ' t heardD. hadn ' t heard8. If it not for the fact thatyou ill now, I would surely punishyou.B. were; wereD. was;

8、 wereA. is; are C. were; are9. Many Chinese movie stars now have given up their Chinese nationality. If I were them, I that.A. shouldn ' t doB. didn 't doC. hadn ' t doneD. won ' t do10. I want to get back by 5 oloc'k cif .B. canD. probableA. likely C. possible11. It seems as if

9、it alreadysummer now but it is only February.A. is B. wasC. were D. had been12. If Henry had not pulled his cap low over his brow, he by thepolice.A. might be recognizedB. might have been recognizedC. would have recognizedD. was to have been recognized13. There is a ring at the door. That _ be the p

10、ostman, I suppose.A. will B. would C. is going toD. was going to14. Look at the dark clouds there _ be a storm.B. must have beenD. wouldA. willC. is going toare you taking thethe wall.15. Why pictures down?I _A. paintB. have just paintedC. am going to paintD. will have paintedCan I stay at home16. t

11、omorrow?Yes, you can if it A. will snowB. is going to snowC. snowsD. snowed17. I don'tknow if he thisafternoon. But if he , I will tell you.A. will come; will do;B. comes; will doC. will come; doesD. comes; does18. I thought I asked you to fix the radio.itOh, I 'msorry. Iright away.A. am to

12、doB. will doC. was about to do D. am going to do19. The WTO can'tlive up to does not include home to one fifthitsname country that mankind.A. as long as C. ifit isB. whetherD. even thougha of20. Ask him him.A. seeC. would seeto ring me up if youB. sawD. will see21. It 'solate. I don't th

13、ink he_ come.A. wouldC. is going toB. shouldD. shall22. If people polluting the air,animals and plants will die soon.A. don 't stopB. didn ' t stopC. shall not stopD. haven' t stopped23. If you an interesting dayout, the Science Museum.A. want; visitingB. want; visitC. want to; visitD. w

14、anting; visit 24. If the pure water is heated to100 centigrade degrees, it boil.A. is going to B. willC. would D. is to25. Is a dictionary available, so, where?B. if isA. ifC. and ifD. and if is.、26. 问题了。27.28. 他了。29. 子似的。30.翻译句子要是我哥哥在这儿，一切都没他那样对待我，好像我是他儿他们谈话的样子好像是多年的33.34.35.如果下雨，庄稼就得救了。 如果你昨天早点来，你

15、就碰见朋友一样。31. 我想今天下午不会下雨。32. 你下星期把车借给我行吗？ 发生的事我谁也不告诉。 我们不准备在那里多呆。 我难受极了，我想我要生病了。Keys:15 BAABB 6 10 DDCAC1115 CBACC 1620 CCBCA21 25 CABBC26. If my brother were here, everything would be all right.27. If it should rain, the crops would be saved.28. If you had come earlier yesterday, you would (might) have met him.29. He treats me as if I were his son.30. They are talking as if they had been fr