因为电视还开着所以他不会离开家了。
Where can they have gone ? 他们会去了哪儿呢?
You cant have finished the novel so soon .
你不可能这么快就看完了那本小说。
could后面接完成式 表示本可能发生或本可以做的事而没有发生或没有做;它的否定形式则表示本不可能发生或本不可以做的事而已经发生或已经做了。例如:
The output could have been increased by 15% .产量本可以提高百分之十五的。
How could he have forgotten him birthday ? 他怎么会忘了自己的生日呢?
Judging from her appearance and manner,she couldnt have been over fifty years old . 从她的仪表和举止来看,她不可能已有五十多岁了。
may后面接完成式 表示可能已经发生的动作。例如:
He may have had some training in Chinese Gongfu .他可能学过一些中国武术。
You may have narrowly missed her on your way to here.
你可能在来这儿的路上刚好与她错过了。
They may have seen that movie.他们或许看过那部电影。
might后面接完成式 表示本可能发生或本可以做的事而没有发生或没有做。例如:
They might have finished their work by now .他们现在或许已经完成任务。
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