I want to know why you came so lately today.这是什么句这句话对吗?是什么句?句子成分是怎么划分的?

I want to know why you came so lately today.这是什么句这句话对吗?是什么句?句子成分是怎么划分的?
I want to know why you came so lately today.这是什么句
这句话对吗?是什么句?句子成分是怎么划分的?

I want to know why you came so lately today.这是什么句这句话对吗?是什么句?句子成分是怎么划分的?
这句话很口语化,是一个宾语从句.why you come so late today 是从句,做want to know 的宾语,从句之前省略了引导词that.我想知道你今天为什么来的这么晚.