The teachig communication requires a perpetual interaction between teacher and students, weather it be teaching or learning. In elaboration of didactic discourse, the teacher should take into account a number of factors, which includes in particular, the amount of information, originality, accesibility and intelligibility of the communicated message. In order to make the information more accessible, the teacher appeals to discursive strategies which simplify and give an intelligible explanation of the contents. The teacher should organize the didactic discourse providing the students' interaction, that practice some basic skills such as: competences of dialogue, the debate, the negotiation and conflict resolution, the ability to formulate arguments. Therefore, by the quality of didactic discourse depends the students successful learning.