過去進行時

標志：was / were + 動詞的現(xiàn)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(xiàn)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(fā)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(fā)生的背景(一個長動作延續(xù)的時候，另一個短動作發(fā)生)：

Granny fell asleep when she was reading.

It was raining when they left the station.

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