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1. Systemic Functional Linguistics
Language itself has been interpreted as a three-level semiotic system, where the discourse-semantic unit, the text, semantically unified through cohesive patterns, is the locus of choices in experiential, textual, and interpersonal meaning. These semantic choices, themselves derived from the need to express context in language, are in turn realized through lexico-grammatical choices, with each semantic dimension relating in a predictable and systematic way to choices from the three simultaneous systems of grammatical structure, Mood, Transitivity, and Theme. The tri-partite structural description of the clause allows to describe how language makes meanings simultaneously. (Eggins p. 307) Read this as you look at the diagram at the end of chapter 4 in Eggins