grammatical representation

例句：

1. 1. The teacher explained the grammar rules in detail.
   老师详细解释了语法规则。
2. 2.The linguist used a graph to represent the phonetic system of the language.
   语言学家使用图表来表示该语言的音系系统。
3. 3. In formal writing, it is important to use correct grammatical representations.
   在正式写作中，正确使用语法表示很重要。