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someone saw a stranger walk into the building,改为被动句

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someone saw a stranger walk into the building,改为被动句
someone saw a stranger walk into the building,改为被动句
A stranger was seen by someone to walk into the building .
加油!不明白再问!
再问: 句型结构是什么?
再答: 固定用法:see sb do sth 变被动结构时TO 要还原,即: sb be seen to do sth 根据SAW 可知是一般过去时,故BE 要用WAS(主语a stranger 是三单) ,SEE的过去分词是 seen