have been being done是什么时态

　　The best information about hotels usually comes from friends and acquaintances who have been there

　　关于酒店的最可靠信息通常来自曾经去过那里的朋友和熟人。

　　We took it as read that he must have been a KGB agent

　　我们完全相信他曾经是一名克格勃特工。

　　There have been some problems but basically it's a good system.

　　虽然出现过一些问题，但这基本上仍不失为一个好系统。

　　I think we're done. I think that's good.

　　我们结束了，我认为不错。

　　I'm coming home I've done my time;

　　我正在回家的路上，我的刑期结束了；

　　And then take her home when she's done.

　　等她结束了再带她回来。