Leia o texto de Brown (2000) para responder às questões de números 49 e 50.

Mistakes must be carefully distinguished from errors of a second language learner, idiosyncrasies in the language of the learner that are direct manifestations of a system within which a learner is operating at the time. An error, a noticeable deviation from the adult grammar of a native speaker, reflects the competence of the learner. Learners of English who ask “Does John can sing?” are in all likelihood reflecting a competence level in which all verbs require a pre-posed do auxiliary for question formation. As such, it is an error, most likely not a mistake, and an error that reveals a portion of the learner’s competence in the target language.