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Modality appears in conversational Spanish markers vamos and vaya as a result of their modal origin from subjunctive forms. Some of their implicit modal values are gone conventionalizing because of their continued interaction with certain contexts, while other ones have weakened as the textual values of these elements were strengthened. In this paper, we focus on one of the modal functions of these markers that has barely been addressed in the literature, despite its considerable functional performance. This is reaffirmation propositional function, which presents distinctive formal and functional features that allows it to be considered as an independent (sub)function of these conversational markers, and in particular, their constructional derivatives and . [ABSTRACT FROM AUTHOR]