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2025年6月大学英语四级语法考试知识点定语从句篇：非限制性定语从句
非限制性定语从句：对先行词起补充说明用途，与先行词关系不密切，可以省略。如：“The man，who is a famous writer，will give us a talk.”
非限制性定语从句的概念
非限制性定语从句对先行词起补充说明用途，与先行词关系不密切，可以省略。假如省略，句子的意思仍然完整。非限制性定语从句一般用逗号与主句隔开。
主要考试知识点
辨别先行词
先行词是定语从句所修饰的名词或代词，可以是人或物。
例句：“The man, who is a famous writer, will give us a talk.”在这个句子中，“The man”是先行词，指人。
例句：“The book, which is on the table, belongs to me.”在这个句子中，“The book”是先行词，指物。
关系词的选择
关系词用于引导定语从句，连接先行词和定语从句。关系词有who, whom, whose, which, that等。非限制性定语从句一般不需要that引导。
who：指人，作主语或宾语。
例句：“The girl, who is standing over there, is my sister.”
whom：指人，作宾语。
例句：“The teacher, whom we respect, is very kind.”
whose：指人或物，作定语。
例句：“The student, whose handwriting is the best in the class, is praised by the teacher.”
which：指物，作主语或宾语。
例句：“The book, which I borrowed from the library, is very interesting.”
非限制性定语从句的地方
非限制性定语从句紧跟在先行词之后，对先行词进行补充说明，一般用逗号与主句隔开。
例句：“The city, which I visited last year, has changed a lot.”在这个句子中，定语从句“which I visited last year”紧跟在先行词“the city”之后，用逗号隔开。
例句：“The person, who called me yesterday, is my old friend.”在这个句子中，定语从句“who called me yesterday”紧跟在先行词“the person”之后，用逗号隔开。
容易见到的非限制性定语从句结构
“名词 + , + which/who...”：用于补充说明先行词。
例句：“The movie, which was released last year, is very popular.”
“名词 + , + whose...”：用于补充说明先行词的所有关系。
例句：“The company, whose CEO is very famous, is expanding rapidly.”
与限制性定语从句有什么区别
限制性定语从句：与先行词关系密切，不可以省略，不然句子意思不完整。
例句：“The man who is talking with my father is my uncle.”假如省略“who is talking with my father”，句子意思不完整。
非限制性定语从句：对先行词进行补充说明，可以省略，句子意思仍然完整。
例句：“The man, who is a famous writer, will give us a talk.”假如省略“who is a famous writer”，句子意思仍然完整。
容易见到的非限制性定语从句例句
例句：“My brother, who is a doctor, will give us a lecture.”
例句：“The house, which was built in 1950, is still in good condition."
例句：“The students, who are very diligent, will pass the exam easily."
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