情态动词 对现在和未来的推测 对过去的推测 使 用 场 合 must + 动词原形
must+ have done 肯定句 may
/ might + 动词原形
May / might+ have done 肯定句、否定句 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: (1)should have done表示“本来应该做某事而实际上未做”,而shouldn’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. (4)could have done表示“本来有可能……而事实上未做到”。如: I could have come on time, but my car broke on the way.
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