the children ( ) on the playground when l left school 为什么用were playing
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the children ( ) on the playground when l left school 为什么用were playing
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
时间状语从句 when I left school 用的是一般过去时,所以主句用过去进行时 were playing,表示“当一个动作发生,另一个动作正在进行”,
The children were playing on the playground when I left school. 当我离开学校时,孩子们在操场上玩he has just come here . No one kno...
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时间状语从句 when I left school 用的是一般过去时,所以主句用过去进行时 were playing,表示“当一个动作发生,另一个动作正在进行”,
The children were playing on the playground when I left school. 当我离开学校时,孩子们在操场上玩
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这句括号里既可以用were playing. 也可以用play ,关键在于,were playing表示当时打眼看到,就在我离学校的时候,表示一瞬间的事情,而用play呢,是表明看到了全过程。
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