过去进行时 Past Continuous

表示在过去某一特定时刻或某一段时间内正在发生的动作。

• 结构公式：主语 + was / were + doing
• 否定式：主语 + was/were not + doing
• 疑问式：Was / Were + 主语 + doing...?
• I was doing my homework at that time. —— 那时我正在做家庭作业。
• When you called me, I was cooking dinner. —— 你给我打电话时，我正在做晚饭。
• While my brother was studying, I was listening to music. —— 我弟弟在学习的时候，我正在听音乐。

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