had been doing是哪种时态

had been doing这是过去完成进行时;表示从过去的某一个时间点开始做某事一直持续到过去的某个时间点并且仍在进行。放在间接引语或虚拟语气中时它的时态不能再向前推，向后推是现在完成进行时。

双语例句

1、Benjamin was forced to admit what he had been doing.

本杰明被迫承认他所做的一切。

2、I had told people what he had been doing, so now the police were onto him.

我已将他的所作所为告诉了别人，因此现在警方正在追查他。

3、Until this summer, China had been doing that carefully.

截止今年夏天，中国一直在审慎地这么做。

4、I had been doing the work for two hours when the teacher came.

老师来时那件工作我已做了两小时了。&当时工作尚未完成，所以老师来了我还继续在做。

5、Everybody knew what he had been doing all those years.

had been doing 和had been done的差别

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 solved.这些问题已经被解决了。

had been done 则是过去的过去，是过去完成的被动态时。(当你想说发生在过去的两件事时，就要分清谁先谁后。先发生的用过去完成时，后发生的要用过去时)。

如：The rooms had been cleaned when I came. 我来的时候，房间已经被打扫了。

2、区分has/have been doing与 had been doing

has/have been doing是现在完成进行时，并对现在有影响。

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.