① He must be playing basketball in the room.
② She may be staying at home.
3) 情态动词+动词完成进行式
情态动词+行为动词完成进行式(即情态动词+ have been + v-ing形式),表示推测或评论过去某动作是否正在进行或一直在进行。例如:
① They should have been meeting to discuss the problem.
② He may / might have been buying stamps in the post office when you saw him.|
三、几组词的辨异
1. can 和be able to
1)情态动词can只有两种时态形式,现在式can和过去式could,而be able to有多种时态形式
Mary can play the piano. She has been able to play it since she was 5.
玛丽会弹钢琴。她五岁起就会弹了。
2)用在过去时中,could经常表示能够做某事,事实上不一定去做,而was / were able to则表示“过去做成了某事”。在否定句中两者可通用。
He could swim across the English Channel. But he didn’t feel like it that day.
他能游过英吉利海峡,但那天他不想游。
Yesterday I was able to get home before the heavy rain. 昨天我在下大雨前赶到了家里。
2. must和 have to语法学习纲要由江苏省靖江高级中学外语组为英语猫网站特供
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