He is a boy who is good at maths who is good at maths是定语从句 那里面的主谓宾是什么吖

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He is a boy who is good at maths who is good at maths是定语从句 那里面的主谓宾是什么吖
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He is a boy who is good at maths who is good at maths是定语从句 那里面的主谓宾是什么吖
He is a boy who is good at maths who is good at maths是定语从句 那里面的主谓宾是什么吖

He is a boy who is good at maths who is good at maths是定语从句 那里面的主谓宾是什么吖
He(主语) is (系动词)a boy who is good at maths who is good at maths(表语)
在表语中有一个定语从句who is good at maths ,修饰a boy.

主语是BOY,谓语是 be good at, 宾语是maths

这个定语从句是个系表结构即be+...;who是关系代词,指代boy,所以是主语;你说的主谓宾在有系动词的情况下,称作系表结构。is就是谓语,good at math是“宾语”。
不明白再问吧