will have been是什么时态

will have been是将来完成进行时态，所谓的将来完成进行时态，时是将来，态是完成进行，将来时结合完成进行态就是将来完成进行时态；

将来完成进行时态的谓语形态为

will + have + been doing

He will have been pleased by Marshal Yazov\'s assurance of the armed forces\' loyalty.

当亚佐夫元帅向他保证武装部队的\'忠诚时，他会感到心满意足的。

History will prove him to have been right all along.

历史将证明他一直是对的。

And it will have been a long, long time.

这将是一段很长很长的时间。

By next year all the money will have been spent.

到明年所有的钱都将花光了。

Next April you will have been teaching English for ten years.

到明年四月你教英语就有十年了。