“情态动词+have done”表推测一览表 情态动词+ have done 用法 例句 must have done 一定已经做了 They must have finished their work. can’t have done 不可能已经做了 They can’t have finished their work could have done 可能已经做了或本来可能做但未做 You could have used my computer because I didn’t use it. may have done 也许已经做了 They may have finished their work. might have done 也许已经做了或本来可以做但未做 You might have used my computer because I didn’t use it. Should/ought to have done 本来该做但未做 You Should have studied hard. need not have done 本来不必做但做了 You need not have gone out. would rather have done 过去宁愿做但未做 I would rather not have gone there. would like to have done 过去想做但未做 I would like to have seen the film. had better have done 当时最好做了某事 You’d better have gone there. “情态动词+be doing”表推测一览表 情态动词+ be doing 用法 例句 must be doing 一定正在做 They must be watching TV now. can’t be doing 不可能正在做 They can’t be watching TV now. May/might be doing 也许正在做 They may be watching TV now. 口诀：“情动”加上 have done,推测事情已经干； “情动”加上 be doing,推测事情在进行； 情态动词+have done 表推测 一、must have done 一定已经做了。 They must have finished their work.他们一定做了他们的工作。 二、1、Can have done.可能已经做了。 2、Can’t have done.不可能已经做了。 They can have finished /homework so quickly.他们可能很快完成他们的工作。 They can’n have finished /homework so quickly.他们不可能很快完成他们的工作。 They can have gone to bed /since /the door is closed.门关着，他们可能已经睡着了。 完成时态+since 三、1、Could have done.可能已经做过。（对过去事情的推测） 2、Couldn’t have done. 不可能已经做过。 You could have used my computer because I didn’t use it.你可能使用过我的游戏机...
