定语从句作为英语语法，在学习过程中属于中较难理解与掌握的部分，也正是由于其复杂程度较高、逻辑性较强、理解难度很大。如果你对这一部分的内容不太熟悉的话，记得看。
1.几个特殊的先行词
(1)way在定语从句中做状语时的三种引导方式 that / in which / 不填
The way in which / that / 不填he explains the sentence to us is quite simple.
比较：The way which /that/不填 he told to us was quite simple.
★way在定语中作tell的宾语
(2)先行词time
time表示“次数”时，用关系代词that引导定语从句
This is the first time thatthe president has visited the country.
time作“一段时间” 讲时，应用关系副词when
This was the time whenthere were no radios, no telephones or no TV sets
★此时when = during which 在..期间
(3)先行词reason当在定语从句中作状语时，定语从句的4种引导方式 why/for which/that/不填
This is the reason why/for which/that/不填he can not come here.
比较：Is this the reason that/which/不填he explained to us for his absence from the conference.
★reason 在定语从句中做explain的宾语
2.介词+关系代词
★该结构的关系代词只有两种即 介词+which（指物） 介词+whom（指人）
★该结构介词的选用原则：
(1)根据定语从句中谓语动词的习惯搭配
This is the book on whichI spent $ 8.
This is the book for whichI paid $ 8.
(2)根据先行词的搭配习惯
I remember the days during whichI lived there.
I remember the day on whichI graduated from university.
(3)根据整个句子所表达的意思来决定
The colorless gas without whichwe can’t live is called oxygen.
(4)英语中为了强调某一名词，不定式前面也可以加上关系代词。
Here is the money with which to buy the piano.
She is the right person on whom to depend
注意：
①如果介词后移，关系代词可以省略
The person (whom/who/that) you will write to is Todd.
②有些含有介词的动词短语介词不能提前如look for/after; take care of; send for; hear from/of/about deal with等
This is the baby that you will look after.
3.定语从句的主谓一致
(1)当先行词是 one of + 复数名词，定语从句的位于动词要用复数形式
The Great Wall is one of the world-famous buildings thatdraw lots of visitor every year.
(2)当先行词是 the only + one of +复数名词，从句谓语用单数形式
The Great Wall is the only one of the buildings on the earth thatis seen from the moon.
(3)先行词如果是整个句子，定语从句的谓语动词用单数
Great changes have taken place in China, asis known to all.
He has passed the driving test, whichsurprises all of us.
4.定语从句的转化
定语从句可以转换为 –ing或-ed形式
The girl (who is) dancing nowjust returned from Taiwan.
I love the stories (which were) written by Hemingway.
The man (who stands) standing thereis my friend.
5. 定语从句的解题方法
(1)判断从句是否为定语从句 （先行词，关系词，定语从句）
(2)准确判断先行词在定语从句中的成分(主、宾、表、定、状)从而正确选定使用关系代词或关系副词
注意：
①关系代词whose的用法。Whose在定语从句中做定语。
当先行词是人：whose = the + 名词 + of whom
当先行词是物：whose = the + 名词 + of which
Do you know the boy whose parents / the parents of whom are on holiday?
I’d like a room whose window / the window of which faces the sea.
②That引导定语从句，名词性从句 和 强调句型的区别:
定语从句中的that: 关系代词，在后面的定语从句中做句子成分。
名词性从句中的that：从属连词，只起连接主从句的作用，在从句中不做句子成分。
强调句中的that, 运用于it is/was…that..结构；判断标准：去掉强调句型结构，成分仍然完整。
比较：
This is the book that I am looking for.
(that 引导定语从句)
It is at Bashu middle school that I have studied for three years.
(that和前面的it is构成强调句型)
The fact that he stole the money surprised all of us.
(that 引导名词性从句--同位语从句)
That he will come to the conference has excited all of us.
(that引导名词性从句--主语从句)
We all expect that they win, for members of their team are stronger.
(that引导名词性从句--宾语从句)
The reason for your failure is that you lack confidence in yourself.
(that 引导名词性从句--表语从句)
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