grammar什么时候加"s"?

可以肯定的告诉你是可数的

grammar
[grámmər]
(plural grammars)
noun
1. rules for language: the system of rules by which words are formed and put together to make sentences
2. particular set of language rules: the rules for speaking or writing a particular language, or an analysis of the rules of a particular aspect of language
Spanish grammar
case grammar

3. quality of language: the spoken or written form of language that somebody uses with regard to accepted standards of correctness
bad grammar

4. grammar book: a book dealing with the grammar of a language
5. analytic system: a systematic treatment of the elementary principles of a subject and their interrelationships
简单的说当指多个具体语法时就是可数的,当指一个总的语法大类时,为不可数
例如3 grammars三种语法:主语从句\宾语从句\状语从句等
EnglishGrammar 这是表示整个英语语法,不加S

grammar是语法的意思，说实话，我不太清楚是不是可数的，反正我没见过grammar后面有s的句子

grammar book: a book dealing with the grammar of a la