are been done是什么時(shí)態(tài)

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

　　有些項(xiàng)目實(shí)際上已經(jīng)這樣去做了。

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

　　但是，正如許多保守派所關(guān)心的那樣，這樣的政策已經(jīng)造了損失。

　　There are reasons why some things have never been done.

　　一些事情一直沒人做，肯定有它的理由。