2. 過去進行時的結構及句型變化

　　過去進行時由"was / were + 現在分詞"構成。如：

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

　　We were cleaning the house. 我們在打掃房子。

　　過去將來時態的肯定句、否定句和疑問句形式：

　　肯定句例句：I was walking down the street when a UFO landed.

　　否定句例句：I wasn't walking down the street when a UFO landed.

　　一般疑問句例句：Were you walking down the street when a UFO landed?

　　特殊疑問句例句：What were you doing when a UFO landed?
 

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