定语从句是英语学习中比较重要的一部分，它可以用来对主语、宾语、表语、定语进行修饰。在定语从句中，连接词起着非常关键的作用。下面是定语从句连接词用法的一览表：
连接词 | 用法 | 例句 -------|-----|------ that | 用于人和物，可以省略 | The book that I bought yesterday is very interesting. who | 用于人，不可省略 | The woman who is standing there is my mother. whom | 用于人，作宾语，可省略 | The man whom I met yesterday is my friend. which | 用于物，可省略 | The car which is parked outside is mine. whose | 用于人或物，表示所属关系 | The boy whose father is a doctor wants to be a doctor too. where | 用于地点 | This is the place where I live. when | 用于时间 | The year when I was born was 1990.
以上是定语从句连接词的用法一览表，希望能够帮助大家更好地掌握英语语法知识。记住，多做练习才能掌握定语从句的用法！
