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should(were to)+动词原 形would/should/could/might +doIf 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 tellyou.如果我知道他的新地址，我会告诉 你的。If he s

2、tudied harder, he would pass theexam.如果他学习再努力点的话，他会通 过考试的。If we had made fuller preparation, weshould 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 tellher the secret.万一她来的

3、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 thesecret.Had we made fuller preparation, weshould have won the game.Had you taken my advice, you wouldn t have been late for the meeting.Should she come, I wou

4、ld tell her thesecret.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 sent2. Mary is ill today. If she _ ,she _ absent from school.A.were not ill; wouldn t beB. had been ill; wouldn

5、t have beenC.had been ill; should have beenD. hadn t been ill; could be3.He acted as if he _everything in the world.A. knew B. knowsC. has knownD. wont know4. If you had enough money, what ?A. will you buyB. would you buyC. would you have boughtD. will you have bought5. If Mr. Young _ with justice,h

6、e _ such a wrong thing.A. were treated; wouldnt doB. had been treated; wouldn havtedoneC. were treated; wouldnt have doneD. had been treated; wouldnt do6. What _ if there _ nolight during the day?A. will happen; wasB. would happen; isC. happens; wereD. would happen; were7. The spokesman acted that w

7、ay as ifheanything about the accidentbut actually he did.A. doesn t hearB. didn t hearC. haven t heardD. hadn t heardyou _ ill now, I would surely punish. If itnot for the fact thatyou.A.is; are B. were; were C. were; are D. was;were9. Many Chinese movie stars now havegiven up their Chinese national

8、ity. If I werethem, I that.A. shouldnt doB. didnt doC. hadnt doneD. wont do10. I want to get back by 5 olockcif _ .A. likelyB. canC. possible D. probable11. It seems as if it _ alreadysummer now but it is only February.A. isB. wasC. were D. had been12. If Henry had not pulled his cap lowover his bro

9、w, 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 postman, I suppose.A. will B. would C. is going toD. wasgoing to14. Look at the dark clouds therebe a storm.A. willB. must have

10、beenC. is going to D. would15. Why are you taking the picturesdown?I _ the wall.A. paintOh, I msorry. IitB. have just paintedC. am going to paintD. will have painted16. Can I stay at home tomorrow?Yes, you can if it_ .A. will snowB. is going to snowC. snowsD. snowed17. I dontknow if he _ thisafterno

11、on. But if he _ , I will tell you.A. will come; will do;B. comes; will doC. will come; doesD. comes; doesI thought I asked you to fix the radio.18.*right away.A. am to do B. will do C. was about to doD. am going to do19. The WTO cantlive up to its name_ it does not include acountry that is home to o

12、ne fifth of mankind.A. as long asB. whetherC. if D. even though to ring me up if youB. sawD. will see_ come.A. wouldB. shouldC.s going to22. If people _ polluting the air,animals and plants will die soon.A. don t stop20. Ask himhim.A. seeC. would see21. It so late.I dont thinkheD. shallB. didn t sto

13、pC. shall not stopD. haven t stopped23. If you _ an interesting dayout, _ the Science Museum.A. want; visitingB. want; visitC. want to; visitD. wanting; visit24. If the pure water is heated to100 centigrade degrees, it _ boil.A. is going toB. willC. would D. is to25. Is a dictionary available, _so,

14、where?A. if B. if is*二、翻译句子26. 要是我哥哥在这儿，一切都没 问题了。27. 如果下雨，庄稼就得救了他了29. 他那样对待我，好像我是他儿 子似的。30. 他们谈话的样子好像是多年的朋友一样31. 我想今天下午不会下雨。32. 你下星期把车借给我行吗？33. 发生的事我谁也不告诉。34. 我们不准备在那里多呆。35. 我难受极了，我想我要生病了Keys:15 BAABB 6 10 DDCACC. and ifD. and if is28.如果你昨天早点来，你就碰见1115 CBACC 1620 CCBCA21 25 CABBC*26. If my brother were here,everything would be all right.27. If it should rain, the crops wouldbe saved.yesterday, you would (might) have methim.29. He treats me as if I were his son.30. They are talking as if they hadbeen friends for many years