I think we should say no to the students who waste things every day.

题目

I think we should say no to the students who waste things every day.
句子的成分.

答案

I think 是“主+谓”后面是that引导的宾语从句,that不作成分可省略.
we是主语 should say no to是合成谓语（情态动词+say no to固定动词短语.to是介词） the students是宾语 后接who引导的定语从句.
who 是从句主语waste从句谓语 things从句宾语 every day从句状语.