过去进行时 表示过去某一时间正在做某事
当我离开学校时 孩子们正在操场上玩这样的怎么判断。过去的某一时间 是 when i left school当我离开学校时left 是 leave 的过去式说明是过去的某一时间孩子们正在操场上玩即是 过去某一时间正在做某事典型的过去进行时过去进行时的构成是was、were +动词ing所以就应该用 were playing了
the children ( ) on the playground when l left school 为什么用were playing
the children ( ) on the playground when l left school 为什么用were playing
英语人气：827 ℃时间：2019-11-02 06:38:14
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