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。