What do you think of the songs by Jay Zhou?这个句子里的定语从句by之前省略了什么
问题描述：
What do you think of the songs by Jay Zhou?
这个句子里的定语从句by之前省略了什么
答
省略了sung
答
省略了written~Jay Zhou创作的歌
答
省略了which are sung/ written/ performed...