這種時態由would/should+完成式構成：
肯定式： I would/should have worked
you would have worked等
否定式： I would not/should not have worked等
疑問式： would/should I have worked?等
否定疑問式： should I not have/shouldn’t I have worked?
would you not have/wouldn’t you have worked?
這種形式用于：
(a)條件句中。
(b)would和should的特殊用法中。
(c)過去時中，相當于將來完成時：
I hope he will have finished before we get back.
我希望在我們回來之前他已經做完。
I hoped he would have finished before we got back.
我曾經希望在我們回來之前他已經做完。