He was in the station looking for a girl.中为什莫要用looking而不是look或looked

问题描述:

He was in the station looking for a girl.中为什莫要用looking而不是look或looked

如果用look 和looked 一句话中没有逗号就出现了两个谓语,不符合语法.
looking 用分词形式表示正在进行的动作,状语.