The non-prototypical and recurrent use of complex constructions initially described on traditional grammars, motivated countless studies of functionalist perspective to describe systematically the phenomenon of insubordination. Researchers as Decat (1993, 2010, 2011), Evans (2007), Mithun (2008), Stassi-Sé (2012), Van Linden and Van De Velde (2014), Hirata-Vale (2015), Sansiñena (2015), among others, dedicate to the description of insubordinate constructions on different languages. These are constructions that present any mark of subordination but are used unlinked from a main clause and, at a certain stage, take its role. Based on theoretical reflections developed particularly by Evans (2007) and Deutscher (2014), the latter about the process of change in languages, it is intended in this work to describe and analyze the trajectory of insubordinate conditional clauses with the conjunctive "se" in Brazilian Portuguese diachrony, in order to expand the description of the phenomenon in this language and contribute to other studies about it.
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