求解释这句话中的定语从句成分!Recently a number of cases have been reported of young children duplicating a violent act previously seen on TV .previously seen on TV .没省略的时候是that was previously seen on TV 如果是的话不是只能省略what么,be动词去哪里了?that不是what，打错了
问题描述：
求解释这句话中的定语从句成分!
Recently a number of cases have been reported of young children duplicating a violent act previously seen on TV .
previously seen on TV .没省略的时候是that was previously seen on TV 如果是的话不是只能省略what么,be动词去哪里了?
that不是what，打错了
答
这里没有定语从句，所谓定语从句，首先要明确的是这个定语必须是一个句子，而你说的PREVIOUSLY SEEN ON TV算是定语，但不是句子，就如DUPLICATING A VIOLENT ACT 也是定语，他也不是句子一样。
答
这里不是定语从句 是过去分词短语作定语 因为逻辑上有被动关系 所以非谓语动词选用过去分词