英文中定语从句是用来修饰名词或代词的从句。在定语从句中，连词的作用是把主句和从句连接起来，使得整个句子有更加明确的意义。英文中常用的定语从句连词有以下几种：
- that：that是最常用的定语从句引导词，它可以引导限定性定语从句和非限定性定语从句。比如：
- The book that I bought yesterday is very interesting.
- My sister, who is a doctor, is coming to visit me.
- who：who通常用于修饰人，在定语从句中作为主语或宾语。比如：
- The man who is standing there is my teacher.
- The girl who I met yesterday is very talented.
- whom：whom也用于修饰人，在定语从句中作为宾语。比如：
- The woman whom I talked to yesterday is my boss.
- The boy whom you met last week is my nephew.
- which：which通常用于修饰物，在定语从句中作为主语或宾语。比如：
- The car which I bought last month is very fast.
- The book which he recommended to me is very helpful.
- whose：whose用于表示所属关系，在定语从句中作为定语。比如：
- The man whose car was stolen is very upset.
- The girl whose father is a doctor is very smart.
以上是英文中常见的定语从句连词，掌握这些连词的用法可以帮助我们更加准确地表达自己的意思。希望这篇文章能够对大家有所帮助！
