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在学习英语语法时，从句是一个重要的概念。从句是一个包含主语和谓语的句子，但是它不能独立存在，必须依附于另一个完整的主句。从句主要分为三种类型：名词性从句、形容词性从句和副词性从句。本文将介绍如何判断从句的类型。
名词性从句
名词性从句在句子中充当名词的角色，可以作为主语、宾语、表语或补语。判断名词性从句的方法是看从句的引导词，通常有以下几种：
- 连词that，例如：I believe that he is honest.
- 疑问词who, what, where, when, why, how等，例如：I don't know what he is doing.
- if/whether，例如：I wonder whether it will rain tomorrow.
形容词性从句
形容词性从句在句子中充当形容词的角色，修饰名词或代词。判断形容词性从句的方法是看从句的引导词，通常有以下几种：
- 连词that，例如：The book that I bought yesterday is very interesting.
- 疑问词who, whose, which, what等，例如：The man whose car was stolen is my neighbor.
- 关系副词where, when, why等，例如：This is the reason why I can't come.
副词性从句
副词性从句在句子中充当副词的角色，修饰动词、形容词或副词。判断副词性从句的方法是看从句的引导词，通常有以下几种：
- 连词that，例如：He said that he would come tomorrow.
- 疑问词when, where, why, how等，例如：I don't know when he will come back.
- 关系副词where, when, why等，例如：I will go wherever you go.
以上是判断从句类型的方法，希望对大家的英语学习有所帮助。
