: In order to account for the variety of texts expressing opinions, and to construct the outline of what would be a form of grammar of opinion, we propose to mobilize a set of enunciative parameters, whose combination makes it possible to unravel, at least partially, the springs from which the different types of texts concerned proceed. They are organized on three levels: a more discursive level relating to the modalities of discourse construction; a more syntactic level, relating to the predicative structures implemented, which is linked to the types of referential objects mobilized, some of them more factual, others more evaluative; a level relating to the types of "voices" mobilized, between doxa and singular point of view, and to the way in which they integrate possible alternative voices.