语言是人与人之间最常用、最有效、最重要的交际工具。马克思曾说过：“外语是人生斗争的一门武器”。无论是工具还是武器，语言最本质的功能是具有交际性。作为交际工具的语言，是由语音、语法和词汇三部分组成的。这三者中的任何一项都不能单独称之为语言，也无法单独起语言? Language is the most commonly used, the most effective and the most important communication tool between people. Marx once said: “Foreign languages ​​are a weapon in the struggle for life.” Whether it is a tool or a weapon, the most essential function of language is to be communicative. The language used as a communication tool consists of three parts: speech, grammar and vocabulary. Any of these three can not be called a language alone, nor can it be a separate language?