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把脉易错点 第十二讲
情态动词和虚拟语气 [名师指津]
情态动词+have done 用 法 must have done 一定做过某事,其否定形式为can’t/couldn’t have done can/could have done 1.本来能够做某事但却未做 2.可能做过某事 can’t/couldn’t have done 不可能做过某事 may/might
have done 或许/可能做过某事 should/ought to have done 本该做但却未做,其否定形式表示本不该做但却做了 needn’t have done 做了本没有必要做的事情 if条件从句 从句的谓语形式 主句的谓语形式 表示现在情况 动词过去式(be的过去式用were) should/would/could/might+动词原形 表示过去情况 had+过去分词 should/would/could/might+have+过去分词 表示将来情况 should+动词原形 should/would/could/might+动词原形 动词过去式 were to+动词原形
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