International audienceIn the systems of Ancient Greek and Modern Greek, the notion that can be called “presumptive” (French “éventuel”) is used in syntactic contexts which are remarkably close (in hypothetical, temporal and relative clauses), even if the morpho-syntactic components are quite different: subjunctive with ἄν in Ancient Greek, bare aoristic verbal form, without any premorpheme, in Modern Greek. We try to go further and to define more accurately the notion of “presumptive” in two ways: we compare the two languages, and we use as a revealing tool the adverb τυχόν which is integrated in the syntatic patterns of presumptive in Modern Greek, but not in Ancient Greek. Our study seeks to provide a contribution to the definition of a c...