Alignment variations in the diachrony of Basque

Besides highly grammaticalized analytic verb forms that constitute the system’s main tense, aspect, and mood forms, Basque has a handful of less grammaticalized periphrases for secondary aspectual and modal meanings. In both older and more recent texts, some of these periphrases have been reanalyzed as monoclausal and readjusted in accordance with the auxiliated verb’s argument structure. This readjustment or actualization process involves changes in two respects: case-marking and indexation through auxiliary change. The reanalysis and actualization of theses periphrases seem to be driven by analogy with highly extended and frequent analytic verb forms. With regard to their actualization, it seems to depend on three factors: word order, valency of the auxiliated verb, and plural patient agreement.