The purpose of this paper is to analyze and comprehend the position of the mother tongue (Portuguese) in the construction of the identity of bilingual subjects, taking into account the strong presence of English as a foreign language in our society. The answers given by four bilingual subjects to a questionnaire designed for this study were analyzed. The discursive analysis of the data shows that the contact between the mother tongue and the foreign language affects the imaginary representations about both languages, as well as the representations about their speakers.