关系副词与关系代词的区别：关系副词在定语从句中做状语，关系代词在定语从句中做主语后者宾语。关系副词和关系代词主要的区别是where、when、why=介词+which。
根据关系词在定语从句中的不同用法，可分为关系代词和关系副词。关系代词主要有who、whom、which、that、whose等，在定语从句中作主语、宾语、定语等；关系副词主要有when、where、why等，在定语从句中作状语。
定语从句关系代词和关系副词区别
关系代词和关系副词的区别主要是：关系代词在从句中作主语或宾语；关系副词在句中作状语。在句子中作定语修饰名词或代词的从句，这种从句有关系代词或关系副词引导并作句子成分，定语从句从句还叫做嵌入句，因形容词定语，所以又称之为形容词性从句。定语从句的位置通常是在先行词后。
关系代词（that,who,whom,whose,which）所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。
1. Is he the man who/that wants to see you?（who/that在从句中作主语，指人）
2. He is the man whom/ that I saw yesterday.（whom/that在从句中作宾语，指人）
3. They rushed over to help the man whose car had broken down.（whose在句中作定语，指人）
4. Please pass me the book whose（of which）cover is green.（whose在句中作定语，指物。若指物，它还可以同of which互换）
5. 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carry的宾语，指物）
关系副词（when,where,why,that）可代替的先行词是时间、地点或理由的名词，在从句中作状语。关系副词when,where,why的含义相当于“介词+which”结构，因此常常和“介词+which”结构交替使用。
6. Beijing is the place where（in which）I was born.
7. Is this the reason why（for which）he refused our offer?
8. His father died the year（that / when / in which）he was born.
9. He can't find the place（that / where / in which）he lived forty years ago.
定语从句关系代词有哪些
关系代词（that,who,whom,whose,which）所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。
例1.Is he the man who/that wants to see you?（who/that在从句中作主语，指人）
例2.He is the man whom/ that I saw yesterday.（whom/that在从句中作宾语，指人）
例3.They rushed over to help the man whose car had broken down.（whose在句中作定语，指人）
例4.Please pass me the book whose（of which）cover is green.（whose在句中作定语，指物。若指物，它还可以同of which互换）
例5.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carry的宾语，指物）
定语从句关系代词只用that的情况
1、不定代词 anything, nothing, everything,all,much,few,any,little为先行词时；
Finally, the thief handed everything that he had stolen to the police.最终，小偷偷的所有东西全部交给了。
2、先行词为 the only, the very, the just时；
He is the very man that helped the girl out of the water.他从水中救起了那个女孩。
3、先行词为序数词、数词、形容词或最高级时；
The first English book that I read was “The Prince and the Pauper” by Mark Twain.我读的第一本书是马克·吐温写的《王子与贫儿》。
4、先行词既有人又有物时；
He talked about the teachers and school that he visited.他在讲他以前访问过的学校和老师。
5、当主句是以who或which开始的特殊疑问句时，为避免重复用that；
Who is the person that is standing at the gate?那个站在门口的人是谁？
6、关系代词作表语时；
He is not the man that he used to be. 他以前不是这样的人。
