请翻译：我想知道你对他持什么态度？

I would like to know about your attitude towards him

attitude是态度的意思 在这里比较适合 但是后面如果跟人做宾语的话 介词固定的是要用towards的 而不是to

opinion是看法 观点的意思

I WANT TO KNOW HOW DO YOU FEEL ABOUT HIM。。。。口语化的

I want to know what's your attitude to him?

I would like to know your opinion about him.