This research investigates the discursive voices involved in the teaching of Portuguese grammar in school contexts: the voice of the educational system, schools, teachers, students and families. The study of these voices which share the same discursive universe, as well as the conceptions they express about grammar, was based on Bakhtin`s (1981, 2000) notions of voice, dialogism and polyphony and on the contributions of research work about Portuguese language teaching (Bagno, 1999, 2002; Geraldi, 1987, 1996, 2002; Perini, 2001; Possenti, 1996, 2002). The main corpus of this study is composed of spoken discourse data that were recorded and transcribed. Interviews (N=52) with teachers, students and student mothers from 5th to 8th grades were conducted in two schools, a private and a public one. A vice-director and a coordinator were interviewed, representing each school. The text of the National Curriculum Parameters (PCNs) for the Portuguese language was added to the corpus in order to represent the voice of the educational system voice. The confrontation of voices is developed around five themes that emerged from the data: grammar teaching, contents, purposes, ways of teaching/learning and linguistic variation. We investigated each discursive voice in order to check how the discourse of a voice reflects the discourse of another voice, emphasizing the aspects in which such voices echo simultaneously. This confrontation of voices allowed us to describe and analyze the different perceptions related to grammar teaching; to identify the contributions of new linguistic theories to Portuguese teaching; to verify that language, grammar and language teaching conceptions affect pedagogic practice; and to realize that, for students, teaching success is related to the way this practice is implemented by teachers in the classroom.