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。
不要忘记及时采纳哦~~~~
追问再问一下，什么时候用“/”呢
追答/ 是指两者都可以，不是说要把这个符号写上去。