Task modality (oral vs. writing) has been found to affect the production, nature and resolution of the language-related episodes (LREs) produced by adult learners in collaborative interaction, a finding also attested in very recent and still limited research with young learners, a population that deserves greater attention in the literature. Besides, previous research has not yet considered the incorporation of LREs in the final output of both oral and written tasks. Nor has it controlled for the differential levels of accuracy that the oral vs. the written modality demand, or the opportunity for revising the output equally in both modalities. Besides, little is known about learners' motivation towards tasks of different modality. This article fills these gaps by examining the effect of task-modality on the production of LREs by 10- to 12-year-old schoolchildren performing an oral+writing task and an oral+editing task, as well as its effect on their task motivation. Task modality effects were evinced in terms of nature and incorporation of LREs, the written mode leading to greater focus on form and incorporation of accurately resolved LREs. The possibility of editing the oral output resulted in enhanced target-likeness of resolved LREs. As for task motivation, learners perceived both tasks as equally motivating.