题目内容：

是help of him与a friend of his 为什么一个用him 一个用his?

优质解答

him 是宾格形式.起到的是名词的作用.of 后面加名词
his 是物主代词,表示他的朋友,相当于his friend.
he he him his his
her she her her her
i i me my mine