過去進行時

標志：was / were + 動詞的現在分詞

1. 表示過去某一時刻或一段時間正在進行的動作，過去進行時中常用的時間狀語有the whole morning, all day yesterday, from January to March last year等。如：

I was having a talk with Lucy at that time.

They were watching TV at home last night.

2. 表示過去反復出現或習慣性的動作，往往包含說話者贊揚、責備、厭惡等情緒，通常與always, constantly, continually, forever等頻度副詞連用。如：

My brother was always losing his keys.

3. 表示按計劃、安排過去某時刻將要發生的動作，僅適用于部分趨向動詞(如go, come, leave, start, arrive等)。如：

He said they were leaving for Beijing this afternoon.

4. 過去進行時有一個主要用法就是描述一件事情發生的背景(一個長動作延續的時候，另一個短動作發生)：

Granny fell asleep when she was reading.

It was raining when they left the station.

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