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woulD hAvE DonE

would have done 在语法时态上称作“过去将来完成时。” 语法教科书上对这个时态的解释是“表示从过去观点看将来某时某动作已完成”,并注明“这个时态用得相对比较少。”例句: I thought Sophia would have told you something. 我想索菲娅会已告诉...

would/should + have + 过去分词 这是虚拟语气的一种用法。 would have done :表示对过去事情的假设,意思是“本来会做”。 比如: I would have told you all about the boy's story, but you didn't ask me. 我本来会告诉你这个小男孩的故事,...

would have been/done本应是/做… 不是对将来事情的推测,而是表示与过去事实相反的情况,虚拟语气。 —————————————————————————————————— 表示与过去事实相反的情况的虚拟语气构成: 从句:Had+过去分词,主句:Should/would/could/might have d...

would have done和 should have done的区别是 would have done :表示对过去事情的假设,意思是“本来会做”。 should have done:表示对过去事情的假设,意思是“本来应该做”。 例句辨析: would have done 1、I would have done it, but I had no...

这两个在虚拟语气里的使用区别不大,一般来说可以换用。但是根据上下文特别强调“本应该...但是”的时候用should have done,would have done也有这个意思,但是'应该'的意味没有should强。

should have done表示,本应做某事却没有做。

根据词语表面意思理解 could来自于can表示能够 could have done 就是说“本能够做到什么”(隐含当时没能达到这个能力) would来自于will表示推测 would have done 是说“本将会怎么做”(隐含当时没有这个意愿) 前者侧重说能力,后者侧重说意愿。 ...

条件状语从句对过去的虚拟结构是从句用过去完成时had done, 主语用would have done的形式,并没有从句If用 would have done的形式。 例1:If Mary had studied hard, she would have passed the final exam. 如果Mary 努力学习的话,她期末考试...

如果是从句用if had done,主句用would have done,是虚拟条件句,而且是跟过去的事实相反的虚拟条件句。也就是说,“要是当时做了或者没做什么事情的话,就不会或者会怎么样了” 但是图片上的最后一句话还不是上面这种类型。而是if had done,主...

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