2018年6月英语四级语法：情态动词
例如：He might have given you more help，even though he was very busy.
3.表责备语气情态动词should，ought to，could，might，need等常用来表示说话人对过去事情的不满或遗憾，带有较强烈的责备语气。
should (ought to) have done “本应该……”，表示过去应该做而(实际)没有做的事情，含有责备或遗憾的语气，其否定形式为“should not/ought not to have done”，should have done还可以表示惊讶、赞叹等情绪。例如：It’s wonderful that you should have achieved so much in these years.
could/might have done “本来能够(会)……”，表示过去本来可以(能够)做某事，但实际上没有做到。
needn’t have done“本来不需要……”，表示过去本来没有必要做某事，但事实上却做了。
三、几个情态动词常考的句型
1.may/might (just) as well“不妨，”，与had better相近。例如： Since the flight was cancelled, you might as well go by train.
2.cannot/can’t…too… “越……越好，怎么也不过分”。注意这个句型的变体cannot…over…。例如： You cannot be too careful when you drive a car. The final chapter covers organizational change and development. This subject cannot be overemphasized.
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