五、定语从句判断关系代词与关系副词

方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如：
This is the mountain village where I stayed last year.
I'll never forget the days when I worked together with you.
判断改错（注：先显示题，再显示答案，横线；用不同的颜色表示出。）
（错） This is the mountain village where I visited last year.
（错） I will never forget the days when I spent in the countryside.
（对） This is the mountain village (which) I visited last year.
（对） I'll never forget the days (which) I spent in the countryside.
习惯上总把表地点或时间的名词与关系副词 where， when联系在一起。此两题错在关系词的误用上。
方法二： 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1. Is this museum ___ you visited a few days age？
A. where　B. that　 C. on which　 D. the one
例2. Is this the museum ____ the exhibition was held.
A. where　　B. that　 C. on which　　D. the one
答案：例1 D，例2 A
例1变为肯定句： This museum is ___ you visited a few days ago.
例2变为肯定句： This is the museum ___ the exhibition was held.
在句1中，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既做了主句的表语，又可做从句的宾语，可以省略关系代词，所以应选D。
而句2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，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。
关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who， whom， that， which， whose)； 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语) 。

六、as，which 非限定性定语从句

由as，which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。
As we know，smoking is harmful to one's health.
The sun heats the earth，which is very important to us.

七、介词+关系代词引导的定语从句

1. 直接位于介词之后的关系代词只能是which或whom，构成介词+which（指物）；介词+whom（指人）两种结构。例如：
The man to whom you talst now is a famous runner.
The service about which the students complain a lot should be improved.
He is a library assistant from whom I borrowed some books.
It is a famous school from which he graduated 3 years ago.
The chair on which he is sitting now is made of wood.
2. 直接位于介词后面的关系代词不能省略，但如果将介词移于句子末尾而不位于关系代词之前时，可省。例如：
The man (who/that/whom) you talst now is a famous runner.
The service (which/that) the students complain about a lot should be improved.
He is a library assistant (whom/that/who) I borrowed some books from.
It is a famous school (which/that) he graduated from 3 years ago.
The chair (which/that) he is sitting on now is made of wood.
2. 关系副词when, where, why 可以相应地转化为：介词+which结构。例如：
This is the house where I lived two years ago.
=This is the house in which I lived two years ago.
Do you remember the day when you joined our club?
=Do you remember the day on which you joined our club?
I don’t know the reason why he said so.
=I don’t know the reason for which he said so.
4. 有一些动词短语中的介词是固定搭配，不可以拆开，一般还是放在动语之后，不提前。例如：
He is the student (who/whom/that) the teachers are looking for.
The number of the children (who/whom/that) she takes care of is 30.
5. 注意复杂介词短语+which或whom引导的定语从句，是高考考查热点。例如：
They finally climbed up the mountain, on top of which many strange birds were seen.
Look at the photo. This is Mr. Green, in front of whom sit three students.
6. 不定代词+of+ which/ whom 引导的定语从句可化为of+ which/ whom+ 不定代词 结构；这也是高考常考点。