这是时间状语从句中常用的省略形式,when 等连词引导的句子也有同样的情况,只要主句主语与从句主语一致,那么就可以用现在分词或者过去分词来表达,被动情况用过去分词,主动用现在分词,比如：
these cultural ingredients are tremendously delicious when combined together.
cultures become extraordinarily pleasant to appreciate only when integrating.
John got injured while playing football last Saturday.
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相关问题
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they played football last saturday.薱they提问
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为什么是Two of the boys got hurt while playing football,
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They often play football on Saturdays.换成football are played
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Why doesn's John play football now?
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He played football last sunday?
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I played football last weekend..
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Tom likes playing the piano while Tim likes playing football
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John likes playing football.So he wants j the football club
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She played basketball last Saturday变成疑问句
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I often play football on Saturdays.划线部分提问划play fo