could have done something 与 should have done something有什么区别?

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could have done something 与 should have done something有什么区别?
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could have done something 与 should have done something有什么区别?
could have done something 与 should have done something有什么区别?

could have done something 与 should have done something有什么区别?
could have done something 本可能做某事
例: I could have studied in Fudan University if I had done better in College Entrance Exam. 假如我高考考好一点的话,本来有可能在复旦大学念书的.
should have done something 本应该做某事 （该做的没做）
例："You should have handed in your homework this morning." the teacher said angrily. 老师生气地说：“你本应上午交作业的.”

前面一个是：本来可以完成某事
后面一个是：本来应该完成某事

could have done something
本可以做某事（过去）
should have done something
该做某事而未作（也是指过去）

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