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新概念辅导:新概念英语第一册语法总结(7)

  7. 过去进行时

  表示过去正在进行的动作,经常用在when, while, as引导的状语从句中。

  结构:was/were+doing

  When my husband was going into the dining room this morning, he dropped some coins on the floor.

  While we were having dinner, my father was watching TV.