should have done 和have done有什么区别

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should have done 和have done有什么区别

should have done 和have done有什么区别
should have done 和have done有什么区别

should have done 和have done有什么区别
should have done 是should do 的过去式形式,实际是虚拟语气形式.表示说话人的后悔,或别人的责备：（过去）该做的事但实际没有去做.本该做的（但没有做）,其否定式：不该做的（却做了）
I should have worked hard in senior one.在高一时我本该用功的（但高一时放松了,没有用功,基础没打好,现在吃力了,后悔了.）
have done 就是正常的现在完成时,实际与上面没有直接关联的.

should have done 虚拟语气，本应该做某事（但却没做）；
have done 一般现在完成时态，已经做完某事

should have done 虚拟语气，（表示对过去发生的事情的一种无法实现的期望），本应该做某事（但实际没有做），例如： i should have done it better.我本来应该做的很好（但实际上我没有做好），本来应该（should) 已经完成了（have done) 的事情没有做，表达一种后悔，惋惜的情绪。
而 have done 如果单拿出来，本身只涉及到 “时态”，...

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should have done 虚拟语气，（表示对过去发生的事情的一种无法实现的期望），本应该做某事（但实际没有做），例如： i should have done it better.我本来应该做的很好（但实际上我没有做好），本来应该（should) 已经完成了（have done) 的事情没有做，表达一种后悔，惋惜的情绪。
而 have done 如果单拿出来，本身只涉及到 “时态”，可以应用到很多句子里，表示已经完成某事，比如说： i have already finished( done) it. 我已经完成了。he has gone.他已经走了。是 do 的现在完成时。

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