16.2 非真实条件句

　　 1) 时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。

　　 a. 同现在事实相反的假设。

　　 句型 ： 条件从句　　　主句　

　　一般过去时　　should( would) +动词原形

If they were here, they would help you.

b. 表示于过去事实相反的假设。

　　 句型： 条件从句　　　 主句　　　

　　　　　 过去完成时　　 should(would) have+ 过去分词

　　 If she had worked harder, she would have succeeded.　

　　 The rice would not have been burnt if you had been more careful.　

　　 If my lawyer had been here last Saturday, he would have prevented me from going.　

　　 If he had come yesterday, I should / would have told him about it.

　　 含义：He did not come yesterday, so I did not tell him about it.

　　 If he had not been ill and missed many classes, he would have made greater progress.

　　 含义： He was ill and missed many lessons, so he did not make greater progress.　

　　 c. 表示对将来的假想

　　 句型：　 条件从句　　　 主句

　　 一般过去时　　　 should+ 动词原形

　　 were+ 不定式　　 would + 动词原形

　　 should+ 动词原形

If you succeeded, everything would be all right.

　If you should succeed, everything would be all right.

　 If you were to succeed, everything would be all right.

16.1 真实条件句

　　 真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。

　　 时态关系

　　 句型： 条件从句　　 主句

　　　　　 　一般现在时　 shall/will + 动词原形

　　 If he comes, he will bring his violin.

典型例题　

The volleyball match will be put off if it ___.　

A. will rain　 B. rains　 C. rained　 D. is rained

答案B。真实条件句主句为将来时，从句用一般现在时。

注意：

　　 1) 在真实条件句中，主句不能用be going to表示将来，该用shall, will.

(错) If you leave now, you are never going to regret it.

(对) If you leave now, you will never regret it.

　　 2) 表示真理时，主句谓语动词便不用shall (will) +动词原形，而直接用一般现在时的动词形式。

23. The doctor did everything he could so that he _________ save the soldier's life.

A. might　　　 B. must 　　　 C. had to 　　　　 D. was able to　

22. But for the Party, he ______ of hunger 30 years ago.

A. died 　　　　 B. would die　　 C. must have died 　　 D. would have died

21. Without your help, I _______ the exam last term.

A. failed in　　 B. would have failed 　 C. wouldn't pass　　 D. would fail

20. If it _______ so hard, we'd go to town.

A. isn't going to rain　 B. doesn't　 C. weren't raining　　 D. isn't raining

19. Our former maths teacher died of cancer last term, otherwise he _________ now.

A. would still be working 　　　　 B. would still have worked

C. should still work 　　　　　　 D. will still work

18. What would you do if the war ____________.

A. would break out　　 B. were to break out 　 C. will break out　 D. is broken out

17. ______ he would have succeeded in the examinations.

A. If he has worked hard 　　　　　 B. If he works hard

C. If he worked hard 　　　　　 D. Had he worked hard

16. "Have you visited the Science Museum?" "No, but I really wish I _______ ."

A. had　　　 B. did 　　　　 C. have 　　　　 D. will