has been done,had been done 的区别是什么?

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has been done,had been done 的区别是什么?
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has been done,had been done 的区别是什么?
has been done,had been done 的区别是什么?

has been done,had been done 的区别是什么?
1、首先要区分has been done与 had been done的区别:have/has been done 是现在完成时的被动语态.表示某事被做,.如:The problems have been

前者是现在完成时态,后者是过去完成时态

前者是现在完成时的被动语态 后者是过去完成时的被动语态