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初中英语学习中，语法是必须要掌握的一项重要内容。而从句则是英语语法中不可或缺的一部分。从句是指在一个复合句中，除了主句以外的一个或多个子句。初中英语语法中，重要的从句有三种：名词性从句、定语从句、状语从句。
名词性从句
名词性从句是指在句子中作为名词使用的从句。名词性从句通常使用引导词“that”、“whether”、“if”、“who”、“whom”、“what”、“which”等。例如：
- I know that you are a good student.
- She asked whether/if he was coming to the party.
- He asked me who/whom I was talking to.
- They don't know what/which book to choose.
定语从句
定语从句是指在句子中作为定语使用的从句。定语从句通常使用引导词“that”、“who”、“whom”、“whose”、“which”等。定语从句一般紧跟在被修饰的名词或代词后面。例如：
- The girl who is standing there is my friend.
- The book that I borrowed from the library is very interesting.
- The man whose car was stolen called the police.
- The shirt which is on the bed is mine.
状语从句
状语从句是指在句子中作为状语使用的从句。状语从句通常使用引导词“when”、“while”、“if”、“although”、“because”、“since”、“until”、“unless”等。状语从句可以表达时间、原因、条件、让步等意义。例如：
- When I was young, I used to play football every day.
- Although it was raining, they still went out for a walk.
- He won't come unless you invite him.
- Because he was ill, he didn't go to school.
以上三种从句是初中英语语法中必须要掌握的重要内容，希望大家在学习英语语法时，能够加深理解并灵活运用。
