一、用"情态动词+have +done"结构表示对过去动作的推测,高考试题中常用过去时态或过去的时间状语给以暗示。情态动词的这一用法可以用 "对立统一"来概括。
1.当试题的前句和后句在动作和意义上相互补充说明,且整个句意在动作和时间上是一个整体时,我们可用"统一"关系来解决这样的试题。常见的结构有:
must have done:
表示对过去动作的肯定推测,常译作"一定做了……",只能用于肯定句中。其否定形式为can't/couldn't have done?
疑问式为Can/Could...have done﹖。
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:
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