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This paper reports on a case study which investigated the effects of recasts on the development of morphosyntactic constructions in the oral performance and grammatical knowledge of a beginning ESL learner. The participant, an adult Korean speaker, received intensive recasts on his morphosyntactic errors during a one-on-one conversational interaction for 10 weeks. The interactions were transcribed and examined with regard to the type of morphosyntactic errors, the type of learner uptake, and the learner's improvement on different types of morphosyntactic errors. The learner’s progress was assessed by means of reduced frequency of errors and improved scores on grammaticality judgment tasks. The results suggested that intensive recasts, provided within the context of conversational interaction, can contribute positively to a beginning learner’s second language (L2) development, especially when targeted at errors of perceptually salient structures. Results are discussed in terms of the efficacy of recasts on different kinds of morphosyntactic features.