The theoryof process types in the transitivity system is a very important part in the Systemic-Functional Grammar by M.
经验功能及物性系统过程理论是韩礼德系统功能语法的重要组成部分。
2
The theoryof theme and rheme is an important functionalsystem where cohesion and coherence of discourse is studied.
主述位理论又是研究语篇衔接与连贯的一大功能系统。
3
The most important characteristics offunctional linguistic theory is that it pays special attention to the study of the relations between the linguistic system and the outside world.