are been done是什么时态

This has been actually done on some projects we are aware of.

有些项目实际上已经这样去做了。

But the damage, as far as many conservatives are concerned, has been done.

但是，正如许多保守派所关心的那样，这样的政策已经造了损失。

There are reasons why some things have never been done.

一些事情一直没人做，肯定有它的理由。