关系代词有：who, whom, whose, that, which等。 关系副词有：when, where, why等。
1. 关系代词所代替的先行词是人或物的名词或代词，并在从句中充当主语、宾语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
(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。如： He is the right actor I want to find for my film.
(2) whose 用来指人或物，只用作定语。 若指物时，它可以同of which互换，互换时为：n + of which。如： Please pass me the book whose cover is torn. Please pass me the book the cover of which is torn.
(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。如： Italy is a famous city which has a lot of great buildings. 2. 关系副词引导的定语从句
关系副词的先行词是时间、地点或理由的名词，如： when, where, why，在从句中作状语。关系副词的含义相当于“介词+ which”结构。如：
Beijing is the place where(in which) I was born.
Is this the reason why (for which) he refused our offer? 3. 判断关系代词与关系副词
(1) 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面要求用关系代词作宾语；而不及物动词则要求用关系副词作状语。如：
This is the mountain village where I visited last year. (错) This is the mountain village where I stayed last year. (对)
I will never forget the days when I spent in the countryside. (错) I'll never forget the days when I worked together with you. (对)
(2) 准确判断先行词在定语从句中的成分（主、谓、宾、定、状），也能正确选择出关系代词/关系副词。 [例句1] Is this museum ___ you visited a few days age? A. where B. that C. on which D. the one
[分析] 正确选项为D。该句变为肯定句为：This museum is ___ you visited a few days ago.
该句所缺部分为宾语，而where, that, on which都不能起到宾语的作用，只有the one既作了主句的表语，又可作从句的宾语，可以省略关系代词，所以应选D。 [例句2] Is this the museum ____ the exhibition was held. A. where B. that C. which D. the one
[分析] 正确选项为A。该句变为肯定句为：This is the museum ___ the exhibition was held.
该句中主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，也可用介词in + which 引导地点状语。如果C项中的which前面加in，也是正确选项。 Step 3 Practices:
Ex1. Join the following two sentences into one using attributive clause. Which woman is a teacher?