I know you are student good at maths I know you are student who is good at maths 这两个句字这两个句子中good at maths 是做定语还是宾补?
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请比较：1 I (主语)know（谓语） you （宾语）to be good at maths (宾语补足语)
2 You are a student （ good at maths ）-----括号中的内容是定语後置,修饰前面的student.
3 I know you are a student (who are good at maths)-------括号中的内容是定语从句,修饰前面的student.
======以下答案可供参考======
供参考答案1:
定语