2016届高考英语一轮复习语法专题情态动词外研版_高考复习指南

　　You might have given him more help，though you were busy with your work.

　　3．must have done 表示对过去行为的推测，意为“一定，想必做过”，语气十分肯定。It must have rained yesterday，as the ground is wet.

　　4．should/ought to have done 用于肯定句时，表示本该做某事，而实际上未做；用于否定句时，则表示不该做某事反而做了。

　　You oughtn't to have been late for the meeting，as it was very important.

　　5．needn't have done 表示本来不必做某事而实际上却做了。

　　I actually needn't have bought so much food—only three people came.

　　6．had better have done 用于事后的建议，含轻微责备的口吻，意为“当时最好做了某事”。

　　I had better have started earlier.

　　1．（2012·课标全国高考）I ______use a clock to wake me up because at six o'clock each morning the train comes by my house.

　　A．couldn't　 B．mustn't　 C．shouldn't　 D．needn't

　　2．（2012·全国高考Ⅱ）I'm going to Europe on vacation together with John if I ______ find the money.

　　A．can

　　B．might

　　C．would

　　D．need

　　3．（2012·北京高考）We ______ the difficulty together，but why didn't you tell me?

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