Past Continuous(過去進行式)

Past Continuous簡單來說就是發生在過去的Long Action，而Simple Past就是發生在過去的Short Action

以下是Past Continuous發生的時機：
1. 在過去被中斷的動作
   e.g. While I was reading , he called.
        I was reading when he called.

2. 特定一個時間點發生
   e.g. I was reading last night at 7.
        At midnight, I was reading.

3. 過去並行的動作
   e.g. I was reading while he was watching TV.

4. 過去常常重覆的動作
   e.g. I was always working late.