“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 workcould have done可能已经做了或原来可能做但未做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也许已经做了或原来可以做但未做You might have used my computer because I didn’t use it
Should/ought to have done原来该做但未做You Should have studied hard
need not have done原来不必做但做了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 w
