can, could, may, might, must 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。例如:
I dont know where she is, she may be in Wuhan. 我不知道她在哪儿,可能在武汉。
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。例如:
At this moment, our teacher must be correcting our exam papers. 这时,想必我们老师正在批改试卷。
3)情态动词+动词完成时,表示对过去情况的推测。例如:
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。例如:
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cant, couldnt表示。例如:
Mike cant 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。
注意:could, might表示推测时不表示时态,其推测的程度不如can, may.
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