全球最新：had been done是什么时态_had been doing
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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。
2、表示某事被做，。
3、 如：The problems have been solved.这些问题已经被解决了。
4、 had been done 则是过去的过去，是过去完成的被动态时。
5、（当你想说发生在过去的两件事时，就要分清谁先谁后。
6、先发生的用过去完成时，后发生的要用过去时）。
7、 如：The rooms had been cleaned when I came. 我来的时候，房间已经被打扫了。
8、 2、区分has/have been doing与 had been doinghas/have been doing是现在完成进行时，并对现在有影响。
9、如句子：I have been dreaming all the night.had been doing是过去完成进行时，也是过去的过去，需要时间先后顺序的对比.如：I had been doing the cleaning before my mother arrived at home.那么现在就可以区分had been doing 和had been done的区别了。
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