with tense in main and embedded clauses. The data in this paper come from elicitation and from narratives collected at different times since the 1990’s. The facts show that there is a restriction in co-occurrence between future tense and the quotative relational only in embedded clauses. Otherwise, the reportative evidential can co-occur with a future tense marker. Moreover, this work investigates the syntactic position of the reportative evidential examining its placement in relation to negative markers and complementizers. Negation offers strong evidence that the evidential one is at the sentential level, since it interacts syntactically and morphologically with negation. Kadiwéu is a language from the Chaco area, located between Paraguay, Argentina, Brazil, and Bolivia. It belongs to the Guaikuruan linguistic family.