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Brazilian Portuguese (henceforth, BP) is currently analyzed as a partial null subject language (NSL). This work shows the earliest attested changes in the properties of null subjects in the Goias dialect of Brazilian Portuguese. We analyze original data from colonial period manuscripts written in Goias, a state located in Brazil’s center-west region, and provide empirical evidence of the loss of null subjects in BP grammars in historical data between the 18th and 19th century, preceding the period for which these changes have been reported regarding other dialects of BP. The analysis of our 18 th and 19 th century corpus shows an early significant rise in the realization of overt subjects. In addition, the loss of verb-subject (VS) free inversion, a property common to NSLs, drops from 57% in the 18 th century to only 22.5% in the 19 th century. On the other hand, a potential impoverishment of theverbal paradigm did not play a significant role in this early rise of overt subjects: only 15% of the clauses with a plural external argument in the 19 th century data did not show overt agreement between the verb and the external argument, and all of them occur strictly with unaccusative or existential verbs. We take this as evidence that the loss of null subjects in BP was primarily linked to the loss of free VS-inversion, and not to the loss of clausal agreement. We propose that D-feature in T (an EPP-feature) was valued by V-movement to T in the 18 th century, yielding a consistent NSL (Holmberg 2010). We argue that the loss of the requirement of the D-feature in T(tense) was a primary trigger for the partial loss of null subjects and parallel loss of free inversion from the 18 th to the 19 th century in Goias BP, giving then rise to a partial NSL (without a D-feature in T).

The emergence of Brazilian Portuguese: Earlier evidence for the development of a partial null subject grammar