省略If的完全倒装Had he known this would happen,he might have acted differently.为什么用might have现在完成时?这个虚拟语气有什么格式吗

省略If的完全倒装
Had he known this would happen,he might have acted differently.
为什么用might have现在完成时?
这个虚拟语气有什么格式吗

有固定格式：
对现在的虚拟（假设）：If条件句谓语动词用一般过去时（be用were)；主句用：would/should/might/could+动词原形.
对将来的虚拟：If条件句谓语动词可用三种情况：一般过去时,should+动词原形,were to+动词原形.主句也用：would/should/might/could+动词原形.
对过去的虚拟：if条件句的谓语动词用过去完成时,即had+过去分词；主句用：would/should/might/could+have +过去分词.
对于以上的if条件句,如果含有had/should/were,则可以把if省略,把had/should/were提前.
楼主说的这套题是讲述对过去的虚拟,故主句用might have+过去分词.本句用had he known...=If he had known...
请采纳为“满意答案”.祝进步.

if 从句后接的时态是过去完成时，主句只能用might，would，could+现在完成式（我没说是 时），如果我没记错，就是酱紫

这个句子是虚拟语气，首先把它恢复成完整句子： If he had known this would happen ,he might have acted differently . 从句是用过去完成时，主句用现在完成时。虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时即had＋过去分词，主句用would / should / could / might + have +过去...

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这个句子是虚拟语气，首先把它恢复成完整句子： If he had known this would happen ,he might have acted differently . 从句是用过去完成时，主句用现在完成时。虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时即had＋过去分词，主句用would / should / could / might + have +过去分词，例如：If it had not rained so hard yesterday we could have played tennis. 熟背虚拟语气的用法。希望对你有帮助。 有什么问题可以问我。

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