could have done ：过去本来能够做到（某事）却没有做.例如
You could have finished your homework yesterday,but you played too much.
should have done：过去本来应该做（某事）却没有做.例如：
You should have been here ten minutes earlier.
祝你开心如意!
could have done 和 should have done的用法是否一样?
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