帮我分析这两个句子

This is the who teaches us mathematics.
这是我们的数学老师
She is the who (whom) I met at the party.
这个女孩是我昨天在派对上遇到的那个

这两句是定语从句 who 后面是从句分别修饰teacher和girl

This is the teacher who teaches us mathematics中who是引导的定语从句，其中who做主语
例：you are the girl who love me
She is the girl who (whom) I met at the party. 中I met 作定语修饰who
例：you are the girl who I love