文档内容
if条件句讲解及练习
从句 主句
与现在事实相反 过去式（be 用were） would/should/could/might+ do
与过去事实相反 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 + do
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 have been 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 her the secret.
万一她来的话，我会告诉她这个秘密。
一、单项选择
1. If I _____ where he lived, I _____ a note to him.
A. know, would have sent B. had known, would have sent
C. know, would send D. knew, would have sent
2. Mary is ill today. If she _____, she _____ absent from school.
A. were not ill; wouldn’t be B. had been ill; wouldn’t have
been
C. had been ill; should have been D. hadn’t been ill; could be
3. He acted as if he _____ everything in the world.
A. knew B. knows C. has known D. won't know
4. If you had enough money, what _____?
A. will you buy B. would you buy
C. would you have bought D. will you have bought
5. If Mr. Young _____ with justice, he _____ such a wrong thing.
A. were treated; wouldn’t do
B. had been treated; wouldn’t have done
C. were treated; wouldn’t have done
D. had been treated; wouldn’t do6. What _____ if there _____ no light during the day?
A. will happen; was B. would happen; is
C. happens; were D. would happen; were
7. The spokesman acted that way as if he _____ anything about the accident
but actually
he did.
A. doesn’t hear B. didn’t hear C. haven’t heard D.
hadn’t heard
8. 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. was; were
9. Many Chinese movie stars now have given up their Chinese nationality. If
I were them,
I _____ that.
A. shouldn’t do B. didn’t do C. hadn’t done D. won’t
do
10. I want to get back by 5 o’clock if _____.
A. likely B. can C. possible D. probable
11. It seems as if it _____ already summer now but it is only February.
A. is B. was C. were D. had been
12. If Henry had not pulled his cap low over his brow, he _____ by the
police.
A. might be recognized B. might have been recognized
C. would have recognized D. was to have been recognized
13. There is a ring at the door. That _____ be the postman, I suppose.
A. will B. would
C. is going to D. was going to
14. Look at the dark clouds—there _____ be a storm.
A. will B. must have been
C. is going to D. would
15. —Why are you taking the pictures down?
—I _____ the wall.
A. paint B. have just painted
C. am going to paint D. will have painted16. — Can I stay at home tomorrow?
—Yes, you can if it_____.
A. will snow B. is going to snow
C. snows D. snowed
17. I don’t know if he _____ this afternoon. But if he _____, I will tell
you.
A. will come; will do; B. comes; will do
C. will come; does D. comes; does
18. —I thought I asked you to fix the radio.
—Oh, I’m sorry. I _____ it right away.
A. am to do B. will do
C. was about to do D. am going to do
19. The WTO can’t 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 though
20. Ask him to ring me up if you _____ him.
A. see B. saw C. would see D. will see
21. It’s so late. I don’t think he ______ come.
A. would B. should C. is going to D. shall
22. If people _____ polluting the air, animals and plants will die soon.
A. don’t stop B. didn’t stop
C. shall not stop D. haven’t stopped
23. If you _____ an interesting day out, ______ the Science Museum.
A. want; visiting B. want; visit
C. want to; visit D. wanting; visit
24. If the pure water is heated to 100 centigrade degrees, it ______ boil.
A. is going to B. will C. would D. is to
25. Is a dictionary available, _____ so, where?
A. if B. if is C. and if D. and 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。28. 如果你昨天早点来，你就碰见他了。
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:
1—5 BAABB 6—10 DDCAC 11—15 CBACC 16—20 CCBCA
21—25 CABBC
26. 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 friends for many years.
31. I don’t think it will rain this afternoon.
32. Will you lend me the car next week?
33. I won’t tell anybody what happened.
34. We are not going to stay there long.
35. I feel terrible. I think I’m going to be sick.
