简单办法:
拿掉定语从句引导词,看从句中缺什么成分,关系代词就作什么成分。
例子:
He is the boy who likes play basketball.
who likes play basketball拿掉who,缺主语,who主语
He is the boy who I am looking for.
who I am looking for拿掉who,缺宾语,who宾语
He is the boy whose father is a teacher.
whose father is a teacher.拿掉whose,缺定语,whose定语
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