The relevance of Saussure's dichotomies were studied by Buson (1990).

Saussure defines fundamental dichotomies that stablished the basis of modern linguistics (Tuson, 1990)

There have been several studies that highlight the importance of Saussurian dichotomies (Tuson 2018, Krashen 2019; Keats 2020).

 Lightbrown (2000) and Toon (2010) analysed the differences between different British accents.

The differences between British accents have been widely identified (Lightbrown, 2000; Toon 2010).

The differences between British accents are very significant (Lightbrown, 2000; Toon 2010; Hymes 2003; Key 2012).

Hyland & Jones (2000) confirmed results from other research conducted in the United States,

Although this method has been tested with some success in the college classroom, it should be universal

In-country writers are in a better position to reflect their own cultural realities