1.Were it not for the snowy weather, we ____ all right.
A. would be B. would have been C. were D. may be
2. ____ more careful, his ship would not have sunk.
A. If the captain were B. Had the captain been
C. Should the captain be D. If the captain would have been
3. If he _____ me tomorrow, I would let him know.
A. should call B. should not have been able
C. were not able D. are not able
4. If you asked your father you _____ permission.
A. may get B. might get
C. should have called D. maybe get
5. ____ today, he would get there by Friday.
A. Would he leave B. Was he leaving
C. Were he to leave D. If he leaves
6. ______I you, I would go with him to the party.
A. Was B. Had been C. Will be D. Were
7.The millions of calculations involved, had they been done by hand, ______all practical value by the time they were finished.
A. could lose B. would have lost
C. might lose D. ought to have lost
8. Had Paul received six more votes in the last election, he______our chairman now.
A. must have been B. would have been
C. were D. would be
9. If you ______Jerry Brown until recently, you’d think the photograph on the right was strange.
A. shouldn’t contact B. didn’t contact
C. weren’t to contact D. hadn’t contacted
10. ______he English examination I would have gone to the concert last Sunday
A. In spite of B. But for C. Because of D. As for
11. Look at the terrible situation I am in! If only I______your advice
A. follow B. would follow
C. had followed D. have followed
13. If the horse won today, it______thirty races in five years.
A. would have won B. won
C. must have won D. did have won
14. There is a real possibility that these animals could be frightened, _______a sudden loud noise.
A. being there B. should there be
C. there was D. there having been
16. Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it ______in a religious, as well as worldly, frame of reference.
A. is to be analyzed B. has been analyzed
C. be analyzed D. should have been analyzed
17. I would have gone to visit him in the hospital had it been at all possible, but I ______ fully occupied the whole of last week.
A. were B. had been C. have been D. was
18. I apologize if I ______you, but I assure you it was unintentional.
A. offend B. had offended
C. should have offended D. might have offended
19. If you hadn’t taken such a long time to get dressed, we’d______there by now.
A. be B. been C. is D. have been
20. The sun rises in the east and sets in the west, so it seems as if the sun ________round the earth.
A. were circling B. circles C. is circling D. be circling
1.A.条件句表示与现在事实相反的虚拟。
2.B.条件句表示与过去事实的虚拟。
3.A.条件句表示与未来事实的虚拟。
4.B.条件句表示与未来事实的相反。
5.C.条件句表示与现在事实的虚拟。
6.D.条件句表示与现在事实的虚拟。
7.B.这个句子中含有一个省略if，把助动词提前到主语they之前的虚拟条件句，该条件句表示对过去情况的假设，而主句中by the time they were finished 表明主句也应该是对过去发生的情况的假设，因而应该选(B)would have lost为正确答案。
8.(D)这道题目是一个混合虚拟语气的句子。条件句省略了if，把助词had提前到主语前面，表示对过去情况的假设，而主句中now表明了对现在情况的假设，所以应选would(should, could, might)+动词原形这种表达形式。四个选项中只有(D)是正确表达形式，故为正确答案。
9.(D)until recently，因此(D)是正确答案，而主句是隐含的对现在情况的假设，该句是一个混合虚拟条件句。
10.(B)假设的情况有时不是用一个条件句表示，而是隐含在一个由介词如but for、but that、without, 由连词but、副词otherwise 、比较级、形容词、独立主格等表示的上下文中。本句主句表示对过去情况的假设，但事实上由于英语考试而没有去成，即若不是因为英语考试，我本可以去听音乐会，所以应选But for为正确答案。
11.(C)题目中的第一句话表示的是现在真实的情况，而第二句话中所要表达的是应该做但事实上没有做的事，这种情况导致第一句话中真实情况的发生，故If only条件句假设的是过去一种情况，因此应该用had +过去分词，所以正确答案是(C)。
12.D.注意主句now表示现在的时间状语，所以主句是对现在虚拟，从句是对过去虚拟。
13.A.从句对过去的虚拟。
14.B.从句表示虚拟，而主句是事实。
15.(D)it是形式宾语，urgent是宾语补足语，that引导的从句是真正的宾语从句，该从句的内容被认为是urgent(急迫的)，这样从句的谓语动词要求用虚拟语气形式，即should(可以省略)+动词原形。因此，本题正确答案是(D)。
16.(C)在表示要求、愿望、建议、请求、命令等含义的名词同位语从句中，从句谓语动词要用虚拟语气形式，即should(可以省略)+动词原形。
17.(D)本道题目的前半句话是对过去情况的一种假设，但事实上并没有发生，而事实上没有发生的真实原因是句子的后半部分由but引导的转折句所表述的真实。因而but所引导的句子中应该用表示志过去事实相符合的表陈述的时态，即一般过去时。
18.(B)此题要求在if从句中选择适当的动词形式，以主句中的动词apologize(抱歉)来看，if从句中表达的内容应该是过去做的事，因此可以排除(A)，因为(A)是现在时。(C)中should+have+过去分词结构表示本来应该做却没有做的事，在此不合题意。(D)选项中的might+have+过去分词表示对过去发生的事情很不肯定的猜测，它表达的内容还不能成为事实，所以藉此道歉真是不知从何说起，因此此处也不合题意。(B)had offended表示当时已经发生了的动作。这是复杂条件句：apologize 是现在，而条件句是表示对过去假设的条件句。
19.(A)该句也是一个复杂条件句(或称作混合虚拟条件句)。条件句表示对过去情况的假设，而主句表示对现在情况的假设，但事实上却与此相反，所以正确答案应该是(A)。
20.(A)as if引导的从句要求用虚拟语气，表示同时或将来的情况，动词要用过去式(be动词用were)或would(could等)+动词原形，本句话中指的是当时的情况，所以要用过去式，故(A)是正确答案。
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