"语法规则"的英文可以是 "grammar rules" 或者 "rules of grammar"。其中，"grammar" 是指语法，"rules" 是指规则，合起来就是 "grammar rules"，或者颠倒一下顺序，就是 "rules of grammar"。
例句：
1. It's important to learn basic grammar rules if you want to become a good writer. (如果你想成为一名优秀的作家，学习基本的语法规则很重要。)
2. Following proper grammar rules can help you effectively communicate your ideas in writing. (遵循正确的语法规则可以帮助你以书面形式有效地表达你的想法。)
3. My English teacher taught me the grammar rules for using adjectives and adverbs correctly. (我的英语老师教我如何正确使用形容词和副词的语法规则。)
4. I made a lot of mistakes in my essay because I didn't pay attention to grammar rules while writing. (我在写文章时没有注意语法规则，因此犯了很多错误。)
5. Adhering to grammar rules is especially important in business communication to maintain a professional image. (在商务交流中遵守语法规则尤为重要，可以保持专业形象。)