This paper reports on a study conducted with female pre-service teachers along the four years of their undergraduate program with major in Portuguese and a Foreign Language (English, Spanish, Italian, Japanese, French or German). The objective was to examine the metaphors, rules of practice and principles that they brought to their process of reflection upon their professional development. I have also identified the roles of these elements in their individual processes of developing their professional identity as teachers. The results were a set of written biographical stories (sources of experiences) in which the participants base themselves to constitute their professional identities as teachers of foreign languages. Within this process, they were able to construct meaningful connections between the theoretical aspects of readings that were undertaken during the research period and the many marking events of their oral narratives about their professional development. The association of the various aspects of their personal stories with the theoretical issues that were discussed during the research reveals processes of professional identity construction as teachers of foreign languages.