過(guò)去進(jìn)行時(shí)

標志：was / were + 動(dòng)詞的現在分詞

1. 表示過(guò)去某一時(shí)刻或一段時(shí)間正在進(jìn)行的動(dòng)作，過(guò)去進(jìn)行時(shí)中常用的時(shí)間狀語(yǔ)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(guò)去反復出現或習慣性的動(dòng)作，往往包含說(shuō)話(huà)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(guò)去某時(shí)刻將要發(fā)生的動(dòng)作，僅適用于部分趨向動(dòng)詞(如go, come, leave, start, arrive等)。如：

He said they were leaving for Beijing this afternoon.

4. 過(guò)去進(jìn)行時(shí)有一個(gè)主要用法就是描述一件事情發(fā)生的背景(一個(gè)長(cháng)動(dòng)作延續的時(shí)候，另一個(gè)短動(dòng)作發(fā)生)：

Granny fell asleep when she was reading.

It was raining when they left the station.

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