1. Her grammar is bad.
    她的文句不通。

2. His grammar is shocking.
    他的文句糟极了。

3. He had great difficulty in learning English grammar.
    他学习英文文法困难重重。

4. This is the best German grammar I''ve seen.
    这是我所见过的最好的德语语法书。

1. 语法学：音系学用来描述人们在交际过程中对于可能的发音的选择.因此, 音系学首先是对于具体语言或是某一特定方言的语音系统的研究.普通音系学的理论是在对于具体语言发音规律研究的基础之上建立起来的.语法学 (grammar) 研究语言的结构规律,

2. 语法知识：根据教学的实际需要,本教程由8个单元组成,每个单元包括听说技能(1istening and Speaking)、阅读技能(Reading)、语法知识(Grammar)和写作技能(Writing)四部分.

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.

\u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD

    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.

grammar在线翻译

    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。

1. the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)