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，屡屡让童鞋们在考试中丢分数、失信心、丧斗志！
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定语从句的10个难点
1.关系代词的省略(限定性定语从句)
(1)关系代词在定语从句中作宾语
She is the girl(whom/that)I loved before.(可以省略whom/that)
(2)关系代词在定语从句中作表语
He is no longer the boy(that)he used to be.(可以省略that)
(3)关系代词作介词宾语，介词在从句句尾时可以省略
Housing price is a problem(that/which)people are interested in.
比较：
Housing price is a problem in which people are interested.（此时只能用which且不能省略）
2.先行词是人(that/who的区别)
(1)用that的情况
①以疑问词who开头的句子中
Who is the man that is shouting there?
②关系代词在从句中作表语时
She is not the girl that she used to be.
③先行词被the very,the right,the only修饰
This is the very person that we are looking for.
(2)用who的情况
①先行词是one,ones,anybody,all,none,those等
Those who want to go to the cinema will have to wait at the gate of the school.
②句子中有两个定语从句,一个用了that,另外一个用who
Who is the boy that won the gold medal?
③在there be结构中
There are many young men who are against him.
④在非限定性定语从句当中
Tom,who is my best friend,has gone abroad to study.
3.先行词是物(that/which的区别)
(1)用which的情况
①在非限定性定语从句中
She lost the game,which depressed her greatly.
②关系词置于介词之后，作宾语
The pen with which you write is Jack’s.
③先行词是that或定语从句中套定语从句,一个关系词用that,另一个用which.
Let me show you the novel that I borrowed from the library which is newly open to us.
(2)用that的情况
①先行词是不定代词如all,little,few,much,anything,everything,nothing,none,no one等
She did all that she could to help us.
②先行词被all,every,no,some,little,much,the only,he very,the right，the last等所修饰时
This is the very book that I want.
③先行词中既有人又有物时
She described in her compositions the people and he places that impressed her most.
④先行词前有序数词或形容词较修饰时
This is the best book that I have ever read.
This is the first film that I’ve seen since I came here.
⑤定语从句中套定语从句，其中一个关系词以用which,另外一个用that
He built a factory which produced things that had never been seen before.
⑥当主句的主语是疑问词which,另一个用that
Who is the person that is standing at the gate?
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