A 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/shouldnt I have worked?

　　would you not have/wouldnt you have worked?

　　B 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。