Human beings are, by nature, social beings; they are predestined to live among their peers with whom they share a number of conventions and norms. The teacher and his learners are constantly interacting. The teacher is always responsible for the production and management of the interactions, and this goes hand in hand with the success or failure of his or her lessons.The objective of this study is to contribute to the knowledge of the professorial action through the observation of the interactions and the analysis of the verbalizations of an observed teacher surveyed. Indeed, it is a question of showing the preponderant and fundamental role of the interactions with regard to the school learning of the pupils and to put in light the multimodal aspect of the aforementioned interactions.