1.指人的时候,who 和that 可充当主语,whom 和that 可充当宾语.
例如：I don't like the person who / that is standing there.(主语)
I don't like the person （whom / that） she saw that day.(宾语)
2.指物的时候,which 和 that 都既可以充当主语也可以充当宾语.
例如：I don't like the book that / which looks dirty.(主语)
I don't like the book (that / which) he likes.(宾语)
3.无论是人还是物,充当定语的都是whose.
例如：I don't like the house whose windows face north.(物)
I don't like the person whose nose is red.(人)
完全由本人手打归类总结,保证正确!
祝学习好!欢迎追问.