She is a girl who love everything beautiful.who前面一般是人
She is a girl whom my borhter loves most.whom也是,但这个人在后面的句子里是宾语
She has a cat that/which couldnt catch mice.that和which 可以指物也可以指人,两个词经常可通用,但如果前面有逗号,则只能用which
She has a cat whose feet get hurt.当后面句子里的主语和前面需要修饰的词是从属关系时则用whose