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英语是世界上最流行的语言之一，随着全球化的发展，学习英语的需求越来越大。在学习英语的过程中，从句是一个非常重要的语法知识点。从句是指在句子中作为一个完整成分的句子，通常由引导词引导。在英语中，从句的种类有三种：名词性从句、形容词性从句和副词性从句。
名词性从句
名词性从句在句子中作为名词，可以作为主语、宾语、表语或同位语。名词性从句的引导词有: that, whether/if, who, whom, which, what, when, where, why等。例如：
- 主语从句：That he is a liar is clear to everyone.
- 宾语从句：I don't know what he is doing.
- 表语从句：The problem is whether we can finish the task.
- 同位语从句：The news that he won the championship made us happy.
形容词性从句
形容词性从句在句子中作为形容词修饰名词或代词，通常用来说明或限制它所修饰的名词或代词。形容词性从句的引导词有: that, which, who, whom, whose等。例如：
- The book that I borrowed from the library is very interesting.
- The girl who is sitting next to me is my friend.
- The picture which hangs on the wall is a masterpiece.
副词性从句
副词性从句在句子中作为副词，用来修饰动词、形容词或副词，通常用来说明时间、地点、原因、目的、条件、结果等。副词性从句的引导词有: when, where, why, how, as, if, so, than, though, unless, until等。例如：
- I will call you when I arrive home.
- He speaks English as if he were a native speaker.
- We can't go out unless it stops raining.
以上就是英语中的三种从句，学习这些从句有助于我们更好地理解和运用英语。希望本文对您的英语学习有所帮助。
