I should have known better是虚拟语气还是过去将来完成时?I have witnessed similar treatment of my family and friends ,so I know what it is like ,and I should have known better.

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Ishouldhaveknownbetter是虚拟语气还是过去将来完成时?Ihavewitnessedsimilartreatmentofmyfamilyandfriends,soIknowwhati

I should have known better是虚拟语气还是过去将来完成时?I have witnessed similar treatment of my family and friends ,so I know what it is like ,and I should have known better.
I should have known better是虚拟语气还是过去将来完成时?
I have witnessed similar treatment of my family and friends ,so I know what it is like ,and I should have known better.

I should have known better是虚拟语气还是过去将来完成时?I have witnessed similar treatment of my family and friends ,so I know what it is like ,and I should have known better.
should have +过去分词 意为“原本应该做某事”,是虚拟语气

虚拟语气吧

我觉得是过去将来完成时。
意为,我知道将来它会变得更好。如果翻译成虚拟语气,则是我本应该知道它会变得更好,似乎句子不通顺。