1）who,whom,that
这些词代替的先行词是人的名词或代词,在从句中作主语和宾语.例如：
Is he the man who/that wants to see you?他就是你想见的人吗?（who/that在从句中作主语）
He is the man whom/ that I saw yesterday.他就是我昨天见的那个人.（whom/that在从句中作宾语）
2）whose 用来指人或物,（只用作定语,若指物,它还可以同of which互换）.例如：
They rushed over to help the man whose car had broken down. 那人车坏了,大家都跑过去帮忙.
Please pass me the book whose （of which） cover is green. 请递给我那本绿皮的书.
3）which,that所代替的先行词是事物的名词或代词,在从句中可作主语、宾语等.例如：
A prosperity which / that had never been seen before appears in the countryside.
农村出现了前所未有的繁荣.（which / that在句中作宾语）
The package （which / that）you are carrying is about to come unwrapped.你拿的包快散了.（which / that在句中作宾语）