过去将来时表示从过去某时看将来要发生的动作，常用于宾语从句。
要点讲解
- 结构：would + 动词原形 或 was/were going to + 动词原形。
- 主要用于宾语从句（主句为过去时）：He said he would come the next day. 他说他第二天会来。
- was/were going to 还可表示过去打算：I was going to call you, but I forgot. 我本打算给你打电话，但忘了。
- 过去将来时的标志：the next day, the following week 等（相对于过去的"将来"）。
- come, go, leave 等的过去进行时也可表过去将来：He said he was leaving soon. 他说他很快就要离开。
- would 与 used to 的区别：would 表过去反复发生的动作（带主观意愿）；used to 表过去习惯（现在已不这样）。
经典例句
- She told me she would help me with my English.
她告诉我她会帮我学英语。 - We didn't know when the meeting would begin.
我们不知道会议什么时候开始。 - I thought it was going to rain.
我原以为要下雨了。
易错提醒
- 主句是过去时，宾语从句表示将来用过去将来时（would do），注意把 tomorrow 改成 the next day。