过去将来进行时表示就过去某一时间而言，将来某一时刻或某一段时间正在进行的动作。主要用于宾语从句 中，尤其多用于间接引语中。

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。

When you asked Li Lei for help, he would never refuse you. 过去当你请她帮忙时，他绝不会拒绝。

(2) was / were going to + 动词原形。如：

He told us that he was going to attend the meeting. 他告诉我说他要参加那次会议。

He said that I was going to be sent to meet her at the railway station. 他说将要拍我去火车站接她

(3) was / were to + 动词原形。如：

The building was to be completed next month. 这座建筑改在下个月竣工。

Li Lei was to arrive soon. 李蕾很快就要到了。

(4) was / were about to + 动词原形。如：

We were about to leave there when it began to rain heavily and suddenly. 就在我们要离开时，天突然下起了大雨。