Little research has been carried out on the effect of task repetition on young learners' negotiation of meaning (NoM) strategies and on pair dynamics. The present study aims to fill this gap by analysing the interaction of 60 dyads of third- and fourth-year primary English as a foreign language learners (8-9, 9-10 years old, respectively) while they perform communicative tasks and assessing whether task repetition has an impact on those constructs. The participants, with a beginner proficiency level established by standardised tests, completed different tasks in dyads at two testing times: at Time 1, all participants completed a spot-the-difference task. At Time 2, 21 dyads repeated exactly the same task, 16 dyads completed a similar task with a different content ("procedural repetition" group) and the last 23 dyads completed a guessing game. The video-recorded oral production was transcribed and codified for NoM strategies (clarification requests, confirmation and comprehension checks, self- and other-repetition, L1 use) and pair dynamics. Results indicate that, overall, there were no statistically significant differences between production at Time 1 and at Time 2 regarding NoM strategies. Regarding pair dynamics, task repetition seems to have a positive effect on collaborative patterns.