类别 从句谓语动词 主句谓语动词 与现在事实相反 过去式(be用were) should/would/could/
might+动词原形 与过去事实相反 had+过去分词 should/would/could/might+have+过去分词 与将来 事实相反 过去式(be用were) should/would/could/might+动词原形 should+动词原形
were to+动词原形 类别 从句谓语动词 主句谓语动词 if省 略句 如果虚拟条件句中含有were/had/should,有时可把if省略,把were/had/should提到主语之前形成倒装,若为否定形式,not不可提前。 混合条件句 有时条件句的动作与主句动作发生的时间不一致,这时动词的形式应根据它们各自表示的时间加以调整。 含蓄条件句 ①有时假设的情况不用条件从句表达,而是用but for,without等介词(短语)或上下文来表示条件。 ②用连词otherwise,or等暗示后文与前面的情况相 反,从而引出后文的虚拟语气。 ③虚拟条件通过but暗示出来,模式为“虚拟情况+but+真实情况”。 与现在事实相反 从句用一般过去时 与过去事实相反 从句用过去完成时 与将来事实相反 从句用would/could+动词原形 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
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