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过去进行时的结构及句型变化 过去进行时由was / were + 现在分词构成。如： 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。 过去将来时态的肯定句、否定句和疑问句形式： 肯定句例句：I was walking down the street when a UFO landed. 否定句例句：I wasnt walking down the street when a UFO landed. 一般疑问句例句：Were you walking down the street when a UFO landed? 特殊疑问句例句：What were you doing when a UFO landed? | 
