would have to的用法

They suggest a cause of the subsequent state of equilibrium or process of simplification that would have to have come into operation at some time after such a pre-historical development.

请问老师would have to have是什么用法？

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分类：虚拟语气

最佳答案 2021-07-21 17:20

must have done 和 have to have done 都可以表示根据现在的迹象对过去发生的情况作十分肯定的推测。如果是根据过去的迹象对过去的过去作肯定的推测就不能用情态动词的现在形式，而要用情态动词过去式，所以说话人用了would have to have done 形式表示根据过去的迹象对过去的过去的情况作肯定的推测。

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曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 2021-07-21 00:14

would have to的用法

最佳答案 2021-07-21 17:20

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