would have been doing是什么时态

例句：

It would have been dishonourable of her not to keep her promise.

她要是不履行诺言就不光彩了。

She would have been well advised to have settled this out of court.

她应该已经被建议在庭外解决此事了。

We made the journey by land , though flying would have been cheaper.

虽然乘飞机会便宜些，我们还是走了陆路。

In the early days, longlines would have been more saturated with fish.

在从前，会有更多的鱼挂满多钩长线。