过去进行的结构

肯定句：主语+ was / were + 现在分词.

I was doing my lessons then. 那时，我在做功课。

We were cleaning the house. 我们在打扫房子。

否定句：主语+was/were not + 现在分词.

I wasn’t walking down the street when a UFO landed.

疑问句：Was/Were not + 主语 + 现在分词?

Were you walking down the street when a UFO landed?

特殊疑问句：特殊疑问词 + was/were not + 主语 + 现在分词?

What were you doing when a UFO landed?

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