一、构成方法
过去将来完成时由“would+have+过去分词”构成。
二、用法及用例
过去将来完成时表示在过去看来将来某时会已经完成的动作：
She said she’d have finished her exams by then. 她说那时她会已经考完试了。
I thought Sophia would have told you something. 我想索菲娅会已告诉你一地情况。
I thought you would have finished by now. 我想你现在一定已经干完了。
There are a lot of things I should have liked to ask you. 有好些事我本想问你的。
He knew by the time he arrived she would have gone home. 他知道他到时她会已经回家了。
Well, well! Who would have guessed it! 真是的! 这谁会想到呀!