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can, could, may, might, must 等情态动词皆可表示推测，其用法如下： 1)情态动词+动词原形。 表示对现在或将来的情况的推测，此时动词通常为系动词。 I don't know where she is, she may be in Wuhan. 2)情态动词+动词现在进行时。 表示对现在或将来正在进行的情况进行推测。 At this moment, our teacher must be correcting our exam papers. 这时，我们老师想必在批改试卷。 3)情态动词+动词完成时。 表示对过去情况的推测。 We would have finished this work by the end of next December. 明年十二月底前我们很可能已完成这项工作了。 The road is wet. It must have rained last night. 地是湿的，昨天晚上一定下雨了。 4)情态动词+动词的现在完成进行时。 表示对过去正在发生事情的推测。 Your mother must have been looking for you. 你妈妈一定一直在找你。 5)推测的否定形式，疑问形式用can't, couldn't表示。 Mike can't have found his car, for he came to work by bus this morning. 迈克一定还没有找回他的车，因为早上他是坐公共汽车来上班的。 | 
