4) could have +过去分词, 表示过去本来可以做但却未做, 译为“完全可以……”。这点与ought/should/ have +过去分词用法相似。
如:What you said is right, but you could have done it better.
5) may/ might have +过去分词, 表示过去可以做但实际未做, 译为“(那样)也许会……”。如:You may have noticed something while you were doing this task.
3.几个情态动词常考的句型:
1)may/might (just) as well “不妨, 最好”, 与had better相近,意为“最好, 还是, 不妨”。
You may as well repeat the experiment.
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….如:You cannot be too careful when you drive a car.驾车时候, 越小心越好。
3) usedn’t 或did’t use to 为used to (do) 的否定式。
Tom used not to rise at six every morning.
4)should 除了“应该”一层意思外, 考研大纲还规定要掌握其“竟然”的意思。如:
I didn’t expect that he should have behaved like that. 我无法想象他竟然这样做。
一. 情态动词被动关系的主动表达法
1.want, require, worth(形容词)后面接doing也可以表示被动意义。
Your hair wants cutting.The work is worth reading.
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