定语从句一直都是语法学习中的一个重要内容，今天考高分教育小编就为您讲解一下定语从句中的 五个难点。
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.
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