being done与 done状语he slipped into the room,without himself being seen,为什么不用seen,而要用being seen ,

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being done与 done状语he slipped into the room,without himself being seen,为什么不用seen,而要用being seen ,
being done与 done状语
he slipped into the room,without himself being seen,为什么不用seen,而要用being seen ,

being done与 done状语he slipped into the room,without himself being seen,为什么不用seen,而要用being seen ,
being seen表示被动语态.题目上说的意思是没有被看见.被动语态要用be动词加动词的过去分词形式.