关系代词可替代的先行词是人或物的名词或代词，并在从句中充当主语、宾语、定语等成分。关系副词可替代的先行词是时间、地点或原因的名词，在从句中作状语。
关系代词用法(that，who，whom，whose，which)
1.Is he the man who/that wants to see you?(who/that在从句中作主语，指人)
他就是想见你的那个人吗？
2.He is the man whom/that I saw yesterday.(whom/that在从句中作宾语，指人)
他就是我昨天见到的那个人。
3.They rushed over to help the man whose car had broken down.(whose在从句中作定语，指人)
他们赶过来帮助那个汽车坏了的人。
4.Please pass me the book whose cover is green.(whose在从句中作定语，指物)
请把那本绿色封面的书递给我。
关系副词用法(关系副词when，where，why的含义相当于“介词+which”)
1.Beijing is the place where(in which)I was born.
北京是我出生的地方。
2.Is this the reason why(for which)he refused our offer?
这就是他拒绝我们建议的原因吗？
3.His father died the year when(in which)he was born.
他父亲在他出生的那年去世了。
4.He can’t find the place where(in which)he lived forty years ago.
他找不到四十年前他住过的地方。
