英汉词典

1. 语法;文法
    Grammar is the ways that words can be put together in order to make sentences.

    e.g. He doesn't have mastery of the basic rules of grammar.
           他还没有掌握基本的语法规则。
    e.g. ...the difference between Sanskrit and English grammar.
           梵文语法与英文语法的区别

2. 文法；语言的运用
    Someone's grammar is the way in which they obey or do not obey the rules of grammar when they write or speak.

    e.g. His vocabulary was sound and his grammar excellent.
           他的词汇丰富，语法也很精通。
    e.g. ...a deterioration in spelling and grammar among teenagers.
           青少年拼写能力和语法知识的下降

3. 语法书
    A grammar is a book that describes the rules of a language.

    e.g. ...an advanced English grammar.
           高阶英语语法书

4. 语法理论；语法学
    A particular grammar is a particular theory that is intended to explain the rules of a language.

    e.g. Transformational grammars are more restrictive.
           转换生成语法局限性更大。