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1、情态动词+have done重要程度： 难易程度：(2015天津) I _ have worried before I came to the new school, for my classmates here are very friendly to me.A. mightntB. mustntC. needntD. couldnt【参考答案】C【拓展延伸】情态动词+ have done1. must have done sth.对过去时间里可能发生的事情的推测，语气较强，表示肯定已经。2. cant have done 表示不可能已经。3. could / may / might hav
2、e done推测过去某事也许已经发生了；也可表示虚拟，意为本可能，本能够。4. ought to / should have done 表示本应该；其否定形式为ought not to / shouldnt have done，表示本不应该。5. neednt have done/not have to do表示本没必要。6. would like /love to have done sth. 表示本打算/本想。1. 我认为这个故事不可能是真的。I thought the story _. 2. 明天我该动身去上海吗？是，你应该。/不，你不应该。Ought I to leave for Sh
3、anghai tomorrow?Yes, you _. /No, you_.3. 他需要先做作业吗？_ his homework first?4. 他无须担心这件事。He _it.5. 房间需要打扫了。The room needs cleaning. =The room needs _.6. 他很强壮，我不敢和他打。He is so strong that I _fight against him.7. (2013浙江) I _ myself more it was a perfect day.A. shouldnt have enjoyedB. neednt have enjoyedC. wouldnt have enjoyedD. couldnt have enjoyed1. could not be true2. ought to; oughtnt to3. Need he do4. neednt worry about5. to be cleaned6. dare not情态动词+have done用法总结：_
