This study sets out to explore the effect of proficiency and modality of interaction on code-switching (CS) amongst two groups of Spanish-Catalan learners acquiring English as a Foreign Language (EFL) in Primary school (grade 3, n = 24 and grade 6, n = 21). Data was retrieved from audio-taped oral activities (peer interaction and learner-teacher…

Despite longitudinal studies conducted along written and oral codeswitching linguistic prevalence considering ESL context, none of the ensuing studies has attempted to propose a theory delineating the preceding occurrence committed by L2 interlocutors which add to the novelty aspect of this paper. The quantitative analysis redounds to the…