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 和have done有什么区别
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