should have done => 表示 应该做而还没有做
shouldn't have done => 表示 不应该做而已经做了
should have done 应该做而未做
shouldn't have done 不该做而已做
Who should have done so?
这件事应该由谁出来过问呢？
You should really have done it yourself.
老实说你应该自己做这件事。
Really, you shouldn't have done it.
说真的，你不该做那事的
I shouldn't have done it but my blood was up and I hit him.
我本不应该做那件事，但我一气之下打了他。
should have done 是指"应该做而未做"shouldn't have done 指"不该做而做了"
应该做的
不该做的
本要做的
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