could /might have done:表示对过去发生的动作的可能性推测,常译作可能做了。如:
1) My sister met him at the Grand Theater yesterday afternoon, so he
_____ your lecture. ?(上海 2000)
A. couldn't have attended
B. needn't have attended
C. mustn't have attended
D. shouldn't have attended
本题选A。
2) Jack ____ yet, otherwise he would have telephoned me. (上海'97)
A. mustn't have arrived
B. shouldn't have arrived
C. can't have arrived
D. need not have arrived (C)
2.当试题的前后句在动作和意义上构成转折关系时,常借助but, however, instead等词来表示过去的动作与客观事实不符,这时我们就可以用对立关系来解决这样的试题。这种结构常见的有:
should have done / ought to have done:表示过去本应该做某事而实际上没有做。
should not have done / ought not to have done:表示过去本不应该做某事但事实上却做了。
need have done:表示过去本来有必要去做某事,但事实上没有做。
need not have done:表示过去本来没有必要做某事,但事实上却做了。如:
3) I was really anxious about you. You _____ home without a word.
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