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Some kinds of hypothetical correlative structures are quite naturally associated withsituations of spoken dialogs as they share a number of specific features characteristic of thiskind of spoken discourse : 1) the fact that speaker and addressee interplay directly indiscursive exchanges, 2) the fact that the correlative relation between the hypothesisemerging from P and the consequence contained in Q is expressed through grammaticalconstructions and enunciative devices based on modal constituents, speech acts, imperativestructures, etc., 3) the fact that the correlative sequence must show a definite prosodicpattern (a suspensive pause on P preceding a falling intonation on Q). On the basis of thesedifferent factors, I will examine two main structure types, one with et ‘and’ representing thehypothesis si p inferred from P, the other with ou ‘or’ bringing about the hypothesis issuedfrom P but endowed with the opposite value.