This quasi-experimental study aimed to investigate the effect of task repetition under four conditions on the three dimensions of oral production (accuracy, complexity and fluency) and grammatical knowledge gain of learners of English as a Foreign Language (EFL). 40 young learners of English as a Foreign Language in four classes were randomly assigned into one of the following groups: repetition in three successive sessions during a week, repetition once a week over three weeks, repetition with one week interval in between over five weeks, and repetition with two weeks interval in between over seven weeks. A Grammatical Judgment Test (GJT) including the prepositions of movement as the target structure was designed to measure learners’ grammatical knowledge both before and after the study. Also, tasks were developed for measuring oral performance of the participants. The findings indicated significant differences in the performance of the groups from pre-test to post-test in terms of accuracy (ratio of error-free clauses) and complexity (syntactic and lexical) dimensions of oral production as well as gains in grammatical knowledge; they however failed to show significant effects for fluency development across distinct time intervals. The paper discusses further findings and implications.
