红豆花花花
英语中常用的关系代词有：which、that、who、whom、whose。根据这些代词在句中的句法功能，可以把它们分为主格、宾格和所有格三类，即：
主格：which、that、who
宾格：which、that、who、whom
所有格：whose
1、which引导定语从句时，在从句中既可以作主语，也可以做宾语。如：
Yesterday I lost the book which my English teacher had given me as a birthday gift. （作宾语）
Yesterday I lost the book which had been given to me by my English teacher as a birthday gift. （作主语）
2、that引导定语从句时，在从句中既可以作主语，也可以作宾语。如：
This is the dictionary that has helped me a lot in my English study. （作主语）
This is the dictionary that you are looking for. （作宾语）
3、who引导定语从句时，在从句中一般作主语。如：
He is the man who called me four times yesterday.
4、whom是who的宾格形式，在定语从句中只能作宾语。如：
She is the woman whom I served just now.
句中的whom因为是作宾语的，所以可以省略。
5、因为whose是所有格形式，表示所属关系，所以在实际使用中，whose后面会紧跟一个名词，才能引导定语从句。如：
She lives in a room whose window opens to the north.
spicyqiezi
relation 名词 n. 1.关系,关联[U][(+between/to)]Their relation seemed quite close. 他们的关系似乎十分密切。 2.(国家,团体,人等之间的)关系,往来[P][(+between/with)]They are anxious to develop friendly relations with their neighboring countries. 他们急于同邻国发展友好关系。 3.血缘关系,亲戚关系[U][(+to)]4.亲戚,亲属[C][(+of)]He had no other near relations. 他没有其他近亲。 5.【婉】肉体关系[P][(+with)]6.【律】(导致起诉的)告发[U][(+of)]7.叙述[U][(+of)]His relation of his adventure fascinated us. 他讲述的关于自己的冒险经历使我们听入了迷。 8.叙述的事,故事[C]relationship名词 n. 1.关系,关联;人际关系[U][C][(+between/to/with)]The children learned about the relationship between the moon and the tides. 孩子们弄懂了月球与潮汐的关系。 2.亲属关系;姻亲关系[U][(+to)] : 3. 风流韵事;恋爱关系[C]What is your relationship to the victim? 你是受害者的什么人?
紫色super
关系词是在英语中引导定语从句的词。它分为关系副词和关系代词。关系词作为英语语法的一个重要组成部分，在英语教育中有很重要的位置。一般中国的学校在初中会教授关系词的知识。
关系副词
关系副词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。
1)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。例如：
There are occasions when (on which) one mustyield.任何人都有不得不屈服的时候。
Beijing is the place where(in which) I was born.北京是我的出生地。
Is this the reason why (for which) he refused ouroffer?这就是他拒绝我们帮助他的理由吗?
2)that代替关系副词，可以用于表示时间、地点、方式、理由的名词后取代when， where， why和"介词+ which"引导的定语从句，在口语中that常被省略。例如：
His father died the year (that / when / in which) he was born.他父亲在他出生那年逝世了。
He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住过的地方。
关系代词
基本关系代词
1)关系代词有that, which, who, whom, whose, as等，绝对没有what。
who, whom, that
这些词代替的先行词是人的名词或代词，who做主语指人，whom作宾语指人，that既可作主语又可作宾语(作宾语可以省略)，可以指人也可以指物。在从句中所起作用如下：
(1) Is he the man who/that wants to see you? 他就是想见你的人吗?(who/that在从句中作主语)
(2) 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)
Whose 用来指人或物
(只用作定语, 若指物，它还可以同of which互换，指人的时候也可以用of whom 代替)
(1) 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。
(2) Please pass me the book whose color (the color of which) is green.请递给我那本绿皮的书。
which, that
它们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，作宾语时可以省略，例如：
(1) 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在句中作主语)
(2) The package (which / that) you are carrying is about to come unwrapped. 你拿那个包裹快要散开了。(which / that在句中作宾语)
