would have been doing是什麼時態

例句：

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

她要是不履行諾言就不光彩了。

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

她應該已經被建議在庭外解決此事了。

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

雖然乘飛機會便宜些，我們還是走了陸路。

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

在從前，會有更多的魚掛滿多鈎長線。