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被动语态by的语序heisbeatenbyhimatonce还是heisbeatenatoncebyhim还有weaskedmarytoplaythepianoforus该被动怎么改还一个呢

题目详情
被动语态by的语序
he is beaten by him at once 还是he is beaten at once by him
还有we asked mary to play the piano for us 该被动怎么改
还一个呢
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答案和解析
he is beaten by him at once 和 he is beaten at once by him 两者都可以,只是可能侧重的方面不一样.
Mary was asked to play piano for us by us.主动改被动一般是变换主语和宾语的位置,谓语用动词的被动形式 be加动词的ed形式.