1. 过去将来时的定义
过去将来时主要用于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。
2. 过去将来时的结构
(1) would + 动词原形。如：
She told us that she would try her best to catch up with other classmates this term. 她告诉我们说她将一切努力在本期赶上其他同学们。
