be taken a waste of time 是固定用法吗?

be taken a waste of time 是固定用法吗? a waste of time 有it is a waste of time doing sth 这种用法吗? be made out of 是固定用法吗? be waste of 和be a waste of区别 waste修饰名词要加of吗 例如a waste of time be taken off the line请问是固定搭配吗? 语法it can be rewarding or just a waste of time改成wasting time most of it being a complete waste of time,but needs to be do 解释keep to 和a waste of time 和be short of 并分别造句 It's a waste of time exactly! A waste of time and effort