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英语中的关系连词（Relative Conjunctions）是用来引导定语从句的单词，它们可以帮助我们更加准确地描述人或物的特征和性质。在英语中，最常用的关系连词有三个，分别是：that、which、who/whom。
that
that 是最常用的关系连词，它可以用来引导限制性定语从句和非限制性定语从句。在限制性定语从句中，that 通常可以与 who/whom 和 which 互换使用。例如：
- The book that I borrowed from the library is very interesting.
- The book which/that I borrowed from the library is very interesting.
在非限制性定语从句中，that 通常不会出现，我们可以用 which 或者 who/whom 来引导非限制性定语从句。例如：
- My friend, who/whom I met in college, is coming to visit me next week.
- My new computer, which I bought yesterday, is very powerful.
which
which 只用于引导非限制性定语从句，用来修饰它前面的名词或者整个句子。它通常放在逗号后面。例如：
- The weather is very nice today, which is a rare thing in this season.
- My car, which I bought last year, has never broken down.
who/whom
who/whom 用于引导修饰人的定语从句，其中 who 用于主语，whom 用于宾语。例如：
- The woman who/whom I saw yesterday is my neighbor.
- The boy who/whom she is talking to is her brother.
总之，了解并正确使用关系连词是英语学习中必不可少的一部分，它们可以让我们的句子更加流畅和准确，为我们的表达增添光彩。
