been加过去分词是什么时态

It's been quite a day, one way and another.

从几方面看，这是不寻常的一天。

Their family has always been well thought of around here.

他们家在这一带一直颇受敬重。

There have been many changes in recent years.

近几年发生了许多变化。

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

控制城市交通的新系统已经设计出来。

We had to work within the parameters that had already been established.

我们必须在已设定的范围内工作。