这种时态由would/should+完成式构成：

　　肯定式： I would/should have worked

　　you would have worked等

　　否定式： I would not/should not have worked等

　　疑问式： would/should I have worked？等

　　否定疑问式： should I not have/shouldn’t I have worked？

　　would you not have/wouldn’t you have worked？

　　这种形式用于：

　　（a）条件句中。

　　（b）would和should的特殊用法中。

　　（c）过去时中，相当于将来完成时：

　　I hope he will have finished before we get back．

　　我希望在我们回来之前他已经做完。

　　I hoped he would have finished before we got back．

　　我曾经希望在我们回来之前他已经做完。