The relative effect of recasts on L2 Korean learners’ accuracy development of two different forms and its relationship with language analytic ability

This study explored the relative effect of recasts on second language (L2) Korean learners’ accuracy development of the object relative clauses (RCs) and the honorific subject–verb (S-V) agreement in Korean and its relationship with language analytic ability (LAA). Forty-five L2 Korean learners participated in the study and five Korean native speakers participated as their dyadic partners. The learners were assigned into the recast group (n = 27) and the control group (n = 18). The recast group received recasts to their errors of the target forms from an interlocutor, a native Korean speaker, during their engagement in four communicative activities, but no recasts were provided to the control group. Three language tests (i.e. a pretest, an immediate posttest, and a delayed posttest) to measure accuracy development and a LAA test were applied to both groups. The study found that recasts benefited L2 Korean learners’ accuracy development of both forms, but their effects were not equal: recasts were more effective for the object RCs than the honorific S-V agreement. In addition, the results showed that LAA had a positive effect on the extent to which the learners benefited from recasts.