为什么及物动词要跟介词+by/with?

问题描述:

为什么及物动词要跟介词+by/with?
fascinate
及物动词 vt.1.迷住,使神魂颠倒;强烈地吸引[(+by/with)]
为什么及物动词要跟介词[(+by/with?

它是及物动词 如:China has always fascinated me.
有时候在被动语态中就要加 by 或 with 呀.he is fascinated with/by the girl.