复习资料（4.2）
2、Syntax as a system of rules 句法是规则系统
Syntax consists of a set of abstract rules that allow words to be combined with other words to form grammatical sentences. A sentence is considered grammatical when it is in agreement with the grammatical knowledge in the mind of native speakers. Universally found in the grammars f all human languages, syntactic rules comprise the system of internalized linguistic knowledge of a language speaker known as linguistic competence.
The syntactic rules of any language are finite in number, and yet there is no limit to the number of sentences native speakers of that language are able to produce and comprehend.
句法是一个由一套数量有限的抽象规则组成的系统，句子由单词组合而成。句子的语法性是指句子的合成必须符合操本族语者头脑中的语法知识。任何一种语言的句法规则都包含了说话者的头脑中的语言知识系统（称为语言能力）。
任何语言的句法规则的数量是有限的，但说话者可以理解和表达的句子的数量是无限的。