This research work presents a discussion of the current conditions of Portuguese Language Teaching, also suggesting a methodology of First Language Teaching based on the guidance of the National Curricular Parameters (Parâmetros Curriculares Nacionais), in which grammar classes assist the development of writing. In order to do that, the use of pronouns is analyzed particularly, in a composition of narrative style written by a Middle School student from a public school in the state of São Paulo, Brazil. Starting from this analysis, the conduction of the student to grammar classes is suggested. This is an attempt to ally the Linguistics Theory of First Language Teaching to the Teacher's practice.