Mr Key gave a call to his sister who teaches mathsin another school.

来源：百度知道编辑：UC知道时间：2024/06/28 11:45:34

这句话的结构我不太懂，who及后面的成分搞不懂，解释一下

句子主干是Mr Key gave acall to his sister,
who为引导定语从句的关系代词替代sister,其后跟定语从句修饰sister；teaches为who的谓语，用现在时表示sister现在在教数学;in another school为介词短语作壮语表明sister是在另一所学校教书.
句意为：Key先生给他在另一所学校里教数学的妹妹打了个电话．

who后面是用来修饰sister的定语从句,相当于定语成分
意为:在别的学校教数学的妹妹.

所以整句话的意思就好理解了:MR KEY给了在别的学校教数学的妹妹一个电话

who后面是his sister的定语从句，修饰限制his sister
的，说明他的姐姐在另一所学校里教数学
注意大小写和空格，应该是Maths in

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