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have done和 had done有什么区别?

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have done和 had done有什么区别?
我知道他们的时态不同,但我还不是太好的区分……
请大家举两个意思差不多只是这两个时态不同的句子并翻译,
例：A have done sth和A had done sth（做的事相同,时态不同）
最好是现场发挥&……我已经看过不少例句了……我看过的不算……
不要超过10组……本人不富裕……
have done和 had done有什么区别?
第一个是现在已完成 现在完成时
第三个时那时已远成,过去完成时
I have finished my homework now
I had finished my homewor when he came
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