This study investigated how synchronous computer-mediated communication (SCMC) and face-to-face (F2F) oral interaction influence the way in which learners collaborate in language learning and how they solve their communicative problems. The findings suggest that output modality may affect how learners produce language, attend to linguistic forms, and solve communicative problems. In particular, the use of collaborative processes to construct utterances was more prevalent in F2F interaction than in SCMC. Moreover, learners engaged in activities and produced language differently depending on output modalities, which differed in terms of the physical, social, and interactional contexts that they created and the way in which they influenced learners' communication strategies. The findings indicate that SCMC should be used selectively according to the pedagogical purpose.