ABSTRACT This paper explores the potential of studies on instructed second language acquisition to inform pedagogical practices for L2 teaching. It focuses on instructional-effect studies published between 2000 and 2024 that examined the acquisition of perfective and imperfective past tense in L2 Spanish, French, and Catalan. Eleven studies were selected based on pretest-posttest designs and evidence of interlanguage development in past morphology. Key findings indicate that perfective forms are typically acquired earlier and more robustly than imperfective forms, regardless of instructional approach or language. The analysis reveals consistent acquisition patterns, suggesting that effective teaching practices can be derived from these studies. Pedagogical implications emphasize the importance of targeted instruction, exposure to both prototypical and nonprototypical form-meaning mappings, and extended learning time for acquiring complex tense-aspect systems. The paper concludes with recommendations for bridging the gap between second language acquisition research and classroom practice, particularly in teaching tense and aspect in Romance languages.
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