mean作名词时是“手段,方法”的意思.作动词是“意思是”.
What do you __?主语是“你”,在此应该是mean.如果主语是he,应该是What does he mean?根本不可能是means.
What's the meaning of ……?是固定搭配,“……的意思是什么?”
对他来说,行为举止有礼貌看似是一件很难的事情.
Behave politely may looks like a difficult thing for him.