核心规则
过去将来时以过去某时为观察点，表达相对于该时刻尚未发生的事情。常见形式有 would do、was/were going to do、was/were about to do 和过去进行时表示的安排。
结构与例句
| 形式 | 意义 | 例句 |
|---|---|---|
| would do | 转述中的将来、过去习惯 | She said she would return. |
| was going to do | 原有计划或迹象 | I was going to call you. |
| was about to do | 当时即将发生 | We were about to leave. |
| was doing | 已安排的未来 | He said he was flying the next day. |
使用场景
它常出现在间接引语、过去叙事和回顾未实现计划的表达中。是否真正发生要由上下文判断，形式本身只说明过去时点的预期。
常见错误
错误： He said he will help us. → 过去转述通常写 He said he would help us。
错误： I was about to leave tomorrow. → about to 表示眼前即将发生，一般不接遥远明确时间。
易混知识点
would 还可表示过去反复发生的动作或委婉语气，不一定都是过去将来；需要根据时间参照和语义判断。
总结
找到过去参照点，再看事件在当时是预测、计划、安排还是即将发生。
高中必修 · 过去视角中的将来
高中学习重点
直接引语变为间接引语时，will 常随过去的转述动词变为 would，时间词也可能相应变化：She said, “I will finish it tomorrow.” → She said she would finish it the next day。若转述内容仍是客观事实或说话时仍有效，可不机械后移。
was going to do 常暗示计划后来改变，但是否未实现仍依赖上下文：I was going to email you, but my computer crashed 明确表示未完成。
小练习
- 改为间接引语：Tom said, “I will join you tomorrow.”
- 选择：When we arrived, the train would / was about to leave.
- 翻译：我原打算早点完成，但数据出了问题。
参考答案
- Tom said he would join us the next day。
was about to。- I was going to finish early, but there was a problem with the data。