Introduction

Abstract

Systemic functional linguistics (SFL) has become a solid and productive theory of language increasingly applied in different fields of sciences to explain language phenomena in use, that is, language doing some work in social contexts. The pioneering work of Michael Halliday and subsequently of researchers who share his theoretical views has produced a vast array of linguistic and social studies which have crossed the boundaries of continents from Australia to Asia and Africa as well as to North and South America.