对过去的事情的推测
might have done; couldhave done;would have done 本来可能做……而未做;本可以做……而未做;本来会做……而未做 ①He might have given you more help, even though he was very busy.②We could have walked there, and it was so near. 与过去事实相反的虚拟表达
情态动词 意义
例句
备注
should/ought to have done 本应该做……而未做
Your brother has failed English exam again. You ought to have given him more help.
表示责备
needn't have done 本不需要做……但却做了 You needn't have wakened me up; I don't have to go to work today.
四、虚拟语气
虚拟语气表示说话人所说的话不是事实,而是一种假设、愿望、怀疑或推测。
虚拟语气在条件句中的用法 if从句 主句
与现在事实相反 if+主语+动词过去式 主语+should/would/could/might+动词原形
与过去事实相反 If +主语+had+过去分词 主语+should/would/could/might+ have+ 过去分词
与将来事实相反 (1) if+主语+动词过去式 主语+should/would/could/ might+动词原形
(2)if+主语+were to+动词原形
(3) if+主语+should+动词原形
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