have you fonud the magazine (hide) by Linda?请说明详细原因

题目

have you fonud the magazine (hide) by Linda?请说明详细原因
被动语态为be +过去分词 为啥这儿没有be动词

答案

hidden hide的过去分词 被linda藏的书
补充完整是have you found the magazine which is hidden by Linda.
which is 可以省略