二、一般过去式的被动语态
承受者+be{was/were +done(过去分词) by+执行者 (不明确可省略)。
E.g.: 主动:He repaired his bike yesterday.
被动:His bike was repaired by him yesterday.
主动:Children cleaned many streets last Sunday.
被动:Many streets were cleaned by children last Sunday.
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