should、would、could在虚拟语气中有什么区别?比如 should have done would have done could have done在用的时候有什么区别?分别用于第几人称?做题的时候是根据人称来选还是根据3个的意思来选?

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should、would、could在虚拟语气中有什么区别?比如 should have done would have done could have done在用的时候有什么区别?分别用于第几人称?做题的时候是根据人称来选还是根据3个的意思来选?
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should、would、could在虚拟语气中有什么区别?比如 should have done would have done could have done在用的时候有什么区别?分别用于第几人称?做题的时候是根据人称来选还是根据3个的意思来选?
should、would、could在虚拟语气中有什么区别?
比如 should have done would have done could have done在用的时候有什么区别?
分别用于第几人称?
做题的时候是根据人称来选还是根据3个的意思来选?

should、would、could在虚拟语气中有什么区别?比如 should have done would have done could have done在用的时候有什么区别?分别用于第几人称?做题的时候是根据人称来选还是根据3个的意思来选?
三个差别很小,做题要根据意思来选,与人称无关!
should have done 过去本该做.（而没有）
would have done 过去若做了（实际没有）将会.
could have done 本可以/本能.

should have done貌似说过去应该完成而没有完成的事情
would have done说的是过去看过去的将来应该已经完成的
could have done说的是一种可能性
他们都可以用于各种人称

should i would i could would could should等在不同时态中的用法在条件句里,什么时候用would,什么时候用should,什么时候用could? should i would i could i should ,would ,might ,could 在用法上的区别在哪里 could would should 在虚拟语气中是如何区别使用的? 关于虚拟语气中的从句~在虚拟语气中,与将来事实相反主句用would/could/should/might do从句用were to 或should do .从句should do中的should能换成would/could/might吗? could/might/may/would/must/should have+过去分词 Could have done would have done should have done can和could,should,would等词语的用法区别? Will would; shall should ;can could区别和用法 虚拟语气中（should would could）应该怎么选择? 是不是WOULD,SHOULD,COULD后面必须跟动词原形 would should migt could have done有什么不同 could be /must be/ should be/would be的区别 should can may would could 有什么区别 should can may would could 有什么区别 虚拟语气中的情态动词帮忙解决下would,should,could,might等在虚拟语气句子中的区别. will would ; shall should ; can could ; must need ; may might以上每组有什么区别,分别应用在什么时候?