I know you are a student good at math.是什么结构.

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I know you are a student good at math.是什么结构.
I know you are a student good at math.是什么结构.

I know you are a student good at math.是什么结构.
I know you are a student good at math.
=I know you are a student (who is) good at math.
I 主语 know 谓语动词,you are a student (who is) good at math.整个是宾语从句.
这个宾语从句中,又有个定语从句,先行词为a student,关系代词who.

1.这个句子是个宾语从句
2.be good at 在什么方面有专长
3.是个省略了that的宾语从句

这是一个含有宾语从句的复合句,其中 I know是主句的主语和谓语,you are a student good at math 是宾语从句,good at math是形容词短语做student的定语。

主位宾补