定语从句是用来修饰名词或代词的从句，通常紧跟在它所修饰的先行词后面。定语从句的关系词包括关系代词（如that, which, who, whom, whose等）和关系副词（如when, where, why等）。下面是一些定语从句的基本分类及其例句：

which引导的非限制性定语从句

例句：The book that I borrowed from the library is very interesting.

as引导的非限制性定语从句

例句：As is well known, the earth is round.

由“介词+关系代词”引导的定语从句

例句：The house at the corner of the street is mine.

由where, when, why引导的定语从句

例句：The city where I was born is beautiful.

whose引导的定语从句

例句：The girl whose name is Lily is my friend.

分隔式定语从句

例句：The book on the table, which is very old, is mine.

关系词省略的限制性定语从句

例句：The book I'm reading is very interesting.

定语从句与其他知识点的综合运用

例句：The city, 75% of whose factories and buildings were gone, lay in ruins.

这些例句展示了不同类型的定语从句及其在句子中的用法。希望这些信息对你有所帮助。