替代是英语文章中常见的一种词汇语法关系，在语篇中发挥衔接功能。
As a common lexical grammatical relationship in English, substitution has cohesive function in the text.
长期以来，我们一直强调语法、阅读理解、词汇以及语言结构在英语学习中的重要性而忽视了语言的交际功能。
For a long time, we focused our attention on grammar, reading comprehension, vocabulary and structure and so on but we ignored the importance of the communicative function of language.
词汇功能语法则从功能结构、主目结构和组构成分结构的层面对约束做了定义。
LFG defines binding at the level of functional structure as well as argument structure and constituent structure.
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