定于从句属耐激于后置定语的一种,是修名词的 eg:I want to do somethng that I want to do.意思是 我想做我想做的事那么宾语从句是一个句子在主句中作宾语,一般用that是引散亩野导,可以省略 eg:I decide (that)I should study better状语从句是在主句中作状语,when I was a student ,I was very happy如果你不知道什么是定语,状语,宾语..你可以再冲喊来问我