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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