I often see him swim in the river改为被动句

I often see him swim in the river改为被动句
He ___ often___ ___ ___ in the river.是被动语态的句子,这节有点没学好,帮帮拉～额还有个问题：汉语已被广泛的使用.Chinese ＿＿＿＿用被动语态