Question: is systemic functional grammar a contemporary language theory

Answer: Yes, Systemic functional grammar (SFG) is a form of grammatical description originated by Michael Halliday. It is part of a social semiotic approach to language called systemic functional linguistics. In these two terms, systemic refers to the view of language as ``a network of systems, or interrelated sets of options for making meaning''; functional refers to Halliday's view that language is as it is because of what it has evolved to do (see Metafunction). Thus, what he refers to as the multidimensional architecture of language ``reflects the multidimensional nature of human experience and interpersonal relations.''