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初中英语学习中，从句是一个非常重要的语法知识点。从句是由一个句子中的一个词或几个词引出的另一个完整的句子，可以分为主语从句、宾语从句、定语从句和状语从句四种类型。
主语从句
主语从句用来充当主句中的主语，常以that, whether, who, whom, whose, what, which等词引导。例如：
- That he is coming is certain. (他来是肯定的。)
- Whether he will come or not is not known. (他来不来还不确定。)
- Who will go with him is not decided. (和他一起去的人还没定。)
宾语从句
宾语从句用来充当主句中的宾语，常以that, whether, if, who, whom, whose, what, which等词引导。例如：
- I know that he is coming. (我知道他来了。)
- I don't know whether he will come or not. (我不知道他来不来。)
- He asked me if/whether I would like to go with him. (他问我愿不愿意和他一起去。)
定语从句
定语从句用来修饰先行词，常以that, who, whom, whose, which等词引导。例如：
- The girl who is singing is my sister. (唱歌的那个女孩是我妹妹。)
- The book that I borrowed from the library is very interesting. (我从图书馆借来的书非常有趣。)
状语从句
状语从句用来表示时间、原因、条件、让步、目的、结果等，常以when, while, as, since, because, if, unless, although, even though, in order that, so that, etc.等词引导。例如：
- When he arrived, we had already finished our work. (他到达时，我们已经完成了工作。)
- Since he is busy, he can't come to the party. (由于他很忙，他不能来参加聚会。)
- If it rains tomorrow, we won't go to the park. (如果明天下雨，我们就不去公园了。)
以上就是初中英语从句的讲解，希望对大家有所帮助，加油！
