This article explores the question of style in a school community, through negation use among the adults and children in a French preschool. Thirteen adults and 61 pupils aged 3–6 years were followed over a period of 2.5 years. The findings draw on a corpus of oral data collected in an unsupervised manner and comprising almost 640,000 transcribed words (428,100 for the children and 210,241 for the adults). The findings show, on the one hand, that the teachers adapt stylistically to their interlocutors and that their professional stance leads to more formal speech and, on the other hand, that the children's use of bipartite negation is marginal before the age of 6 years and does not present notable stylistic variations.