Hasan（Halliday&Hasan,1989）把语类研究纳入到语篇层面，她首先提出了语类结构潜势理论（generic structure potential），认为一个语类是产生一个语域的所有语篇的结构潜势。换句话说，一个语篇是语言使用者从语类结构潜势中选择的结果。
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根据哈桑的语类结构潜势理论，语类结构由必选成分和可选成分及其重复成分和顺序组成。
According to Hasan's generic structure potential theory, a generic structure is constituted of the obligatory elements, the optional elements, their recursive elements and their sequence.
本文的研究假设是：（1）语类结构潜势理论对大学英语实用写作教学能够产生何种作用，是积极的，还是消极的?。
The author puts forward two hypotheses which are: 1. What kind of effects does the GSP theory have on the college English practical writing, positive or negative?
哈桑的语类结构潜势理论只针对柜台服务商业语类的语篇结构成分及顺序的选择，没有涉及在文化语境的制约下各种语类的生成。
Hasan's GSP only focuses on options of structural elements and their sequences in counter-service business genre, without study the generation of various genres in context of culture.
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