would has been done是什麼時態

The company has been investing in new plant and equipment.

這家公司一直在投資購置新機器和設備。

A new system has been devised to control traffic in the city.

控制城市交通的新系統已經設計出來。

Digital television has been around for some time now.

數字電視已經面市一段時間了。

The problem is to get it all done in the time available.

問題是要在現有的`時間內把它全部完成。

This is the way we've always done it.

我們一直是這樣乾的。