who 是在定语从句中作主语,比如The girl who is in red is my sister.
whom 是在定语从句中作宾语,比如The girl whom he loves is warm-hearted.
whose是表从属关系,whose +名次在定语从句中可以和 of which the +名词互换,比如The
boy whose shirt is white is my brother.
=The boy of which the shirt is white is my brother.