過(guò)去進(jìn)行的結構

肯定句：主語(yǔ)+ was / were + 現在分詞.

I was doing my lessons then. 那時(shí)，我在做功課。

We were cleaning the house. 我們在打掃房子。

否定句：主語(yǔ)+was/were not + 現在分詞.

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

疑問(wèn)句：Was/Were not + 主語(yǔ) + 現在分詞?

Were you walking down the street when a UFO landed?

特殊疑問(wèn)句：特殊疑問(wèn)詞 + was/were not + 主語(yǔ) + 現在分詞?

What were you doing when a UFO landed?

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