He cant have stolen the money; he is not such kind of person.
Some pleasant thing must have happened to him. He is so excited.
3) 注意推测性用法中谓语动词发生的时间。
如果推测的为过去的事情,情态动词后则用完成形式。
There must have been no one in, for nobody answered the phone.
如果推测的是正在进行的事情,情态动词后则用动词的进行形式。
They must be talking about something very secret.
如果推测的是现在的状态等,情态动词后则用原形动词
He must be badly ill. He looks so pale.
如果推测的是将来发生的事情,情态动词后同样用原形动词,这时,情态动词只能是may/might。
There may be a terrible storm in the following few days.
4) 注意情态动词+动词的完成形式所表达的意思与题干意思是否相符。
其它情态动词+ 动词的完成形式并不表示推测,而分别表示:
could have done本来能够
He didnt take part in the competition, he _______ though.
A. won B. didnt win C. could win D. could have won
neednt have done 本来没不要
You ________. There was plenty of time.
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