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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? (责任编辑：admin) |