what do you think of him 中of 的用法

问题描述:

what do you think of him 中of 的用法
这句的意思我明白 但是我不明白为什么用用of 呢
what do you think him 不行嘛 为什么要加个of 呢 我很郁闷

think of 是一个词组,连在一起的,表认为...怎样