宋庆龄的相关资料:英语一个特别不常用的时态，对英语有相当的研究的大侠进。

过去将来完成进行时的形式
一）构成：I (we) + should have done 或He (she it they you )+ would + done
（二）用法：过去将来完成时表示在过去将来某一时间以前发生的动作，并往往会对过去将来某一时间产生影响。它常和表过去将来的时间状语连用.

过去将来完成时
should / would have done sth.
用法举例:)~
We hoped that she would have got the plan ready before we came back. 我们希望她能在我们回来
之前把计划做好。
He said he would let me have the book as soon as he had read it. 他说书一看完就借给我。
2、 过去将来完成时还常用在虚拟语气中，表示与过去的事实相反。如：
If I had seen him this anteroom, I would have told him about it. 今天下午我要是见到他，我会告诉他那件事的。

sb would have been doing
i would have been studying in university if i had passed the exam
一般是表虚拟的吧
如果当时我考试过了我就会在大学读书

有!

一般形式是:would+have+been+doing

They said that by the end of the following month, the project would have been being worked for 3 years.
（他们说到第二个月底为止，这项工程就已经不停地进行了3年了。）

过去将来完成进行时：在过去某时之前看来将来某时应该已经完成并且还要延续下去的动作。{很少用}