过去将来时的定义是什么（过去将来时的用法详解）

过去将来时表示过去某个时候看来即将发生的动作或存在的状态。如：

He said he would come here next Friday. 他说他下周星期五来这儿。

I knew that he would help us when we were in trouble. 我知道当我们陷入困境时它会帮助我们。