关键词：主从句划分符号
在英语语法中，主从句的划分主要依靠以下符号：
1. 逗号加从属连词：如“if, because, although, since, when, while, until, as, unless, that, whether...or...”等。
2. 冒号：用于引出从句，如：“I have a lot of work to do: I need to finish my assignment, study for the exam, and prepare for the presentation.”
3. 破折号：用于插入从句，如：“He was tired—he had been working all night.”
4. 分号：用于连接两个独立但相关的从句，如：“She loves to read; she reads every day.”
5. 括号：用于插入非限制性定语从句，如：“The book (which she bought yesterday) is very interesting.”
掌握这些符号，可以帮助我们更准确地划分主从句，提高英语语法水平。
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