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过去进行时态（past progressive tense）对比学习：现在进行时举例：1.I am talking to you now.2.She is listening to the teacher now.3.They are taking photos now.4.We are having English class now.过去进行时举例：1.I was taking a shower at 8 last night.2.She was doing her homework at the time of the rainstorm.3.They were taking photos when the rainstorm came.4.We were reading in the library while Linda was sleeping.“doing”构成规律：