The aim of this article is to describe and discuss one area of enquiry within the broad field or research into learning: the study of the educational functions of talk in the classroom, the relashionship between social activity and individual thinking is a vital, distinctive characteristic of human congition, and one which underpins cognitive development.
     Vygotsky, 1962 and Vygotsky, 1978 argues that the acquisition and use of  language transforms children's thinking. He describes language as both a cultural tool. Those activities social and intersocial, are the most important for their capabilities, which children join in activities, generating new understandings and ways of thinking, and teachers play an role important if we want to improve students' abilities of thinking and join in this activities, teachers can be a powerful guide in order to develop and increase the adematic performance.
      In a word, in a didactic ambient, teachers and students playing a role inseparable, teachers teaching and students, learning. When the teacher is teaching, need to maintain a good communication with students, that is to say, students and teachers are a relashionship between teaching and dialogue .