過(guò)去進(jìn)行時(shí)可以表示在過(guò)去某個(gè)時(shí)間點(diǎn)發(fā)生的事情。

時(shí)間點(diǎn)可以用介詞短語(yǔ)、副詞或從句來(lái)表示。例如：

What was she doing at nine o'clock yesterday?

昨天晚上九點(diǎn)她在做什么? (介詞短語(yǔ)表示時(shí)間點(diǎn))

She was doing her homework then.

那個(gè)時(shí)候她正在寫作業(yè)。(副詞表示時(shí)間點(diǎn))

When I saw him he was decorating his room.

當(dāng)我看見(jiàn)他的時(shí)候他正在裝飾房間。 (when從句表示時(shí)間點(diǎn))

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