This paper has two main aims to be achieved. The first one relates to identifying concepts of language and linguistic variety subjacent to school texts correction led by teachers of mother tongue, whereas the second one concerns the elicitation of the relation between those concepts and the correction/evaluation practices adopted by the teachers. For that, two compositions were corrected and evaluated by a group of teachers to be. Afterwards, they were required to justify the grades given. The analysis was based on theoretical principles in relation to teacher training, correction/evaluation practices, and language concepts as well. The results show that although teachers correct compositions based mainly on code rules, during the grades justification phase they refer to discursive information. This implies that despite the fact that they have acquired a modern theoretical discourse, they still adopt traditional corretive practices.