情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有何关系?

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情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有何关系?

情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有何关系?
情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有何关系?

情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有何关系?
should have done“本应该做某事”
might have done“可能做过某事”
could have done“本可以做到某事”
would have done“本愿意做某事”
都是表示与过去事实相反.if条件句中的虚拟基本含义相同,只是要注意主从句时态一致.

should / might / could would + have done 在if条件句中表示与过去事实相反，也就是本
应该/可能/总会。。。但实际情况是没有这样。

may / might +不定式完成式（have done）表示对过去行为的推测。不能用于疑问句中，不是虚拟语气的用法。Might所表示的可能性比may小。
还有must have done. 也只是表推测，更为肯定。

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