過去進行時表示過去某段時間內持續進行的動作或者事情。

常用的時間狀語this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while等。例如：

We were watching TV from seven to nine last night.

昨天晚上七點到九點的時候我們在看電視。

What was he researching all day last Sunday?

上周日他一整天都在研究什么?

My brother fell and hurt himself while he was riding his bicycle.

我哥哥騎自行車的時候從車上摔下來，受傷了。

It was raining when they left the station.

他們離開車站的時候天正在下雨。

When I got to the top of the mountain, the sun was shining.

當我到達山頂的時候，陽光燦爛。

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