非限制性定语从句中能用who。
who引导
Our guide,who was a French Canadian,was an excellent cook.
我们的向导,一个法裔加拿大人,擅长于烹调。
My gardener,who is very pessimistic,says that there will be no apples this year.
我家的园丁非常悲观,他说今年将不结苹果。
whom引导
关系代词whom用于指人,在句中作动词宾语和介词宾语,作介词宾语时,介词可位于句首。
如:Peter, whom you met in London, is now back in Paris.
彼得现在回巴黎了,你在伦敦见过他。
Mr Smith,from whom I have learned a lot,is a famous scientist.
史密斯先生是一位著名的科学家,我从他那儿学了许多东西。
whose引导
whose是关系代词who的
所有格形式,在从句中作定语。whose通常指人,也可指动物或无生命的事物。
如:The boy, whose father is an engineer, studies very hard.
那位父亲是位工程师小男孩学习很努力.
希望能帮助到你,望采纳!