2017高考英语备考复习：情态动词2_高考复习指南

　　may / might may / might + 动词原形 May / might have done 肯定句、否定句

　　can /could can / could do Can / could have done 否定句、疑问名（could可用于肯定句）

　　should 用来表示一种估计的情况“按理会/估计会”should do/be should have done 肯定句、否定句、疑问句

　　例如：

　　It must have rained last night.

　　She may not be at home. = It is possible that she is not at home.

　　She can’t be at home. = It is impossible that she is at home.

　　They should be there right now.

　　3、情态动词在虚拟语气中的用法

　　情态动词用于虚拟语气中表示责备的感情色彩，用法如下：

　　（）should have doneshouldn’t have done则表示“本不应该做某事而实际上做了”。如：

　　You should have told me about it earlier.

　　You shouldn’t have said such words to your parents.

　　（2）ought to have done也表示“本应该……”而ought not to have done则意为“本不应该……”。如：

　　You ought to have told me about it earlier.

　　You ought not to have said such words to your parents.

　　（3）needn’t have done表示“本无必要做某事而实际上做了”。如：

　　You needn’t have walked so quickly since time was enough.

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