This article examines the relationships between second language acquisition (SLA), instructed second language acquisition (ISLA), and language teaching by examining them from the lens of the research on the acquisition and teaching of second language (L2) tense-aspect in the last 20 years (2000?2021). Review 1 examines 56 instructional effect studies on the acquisition of L2 tense-aspect, and Review 2 examines 38 pedagogical proposals for the teaching of L2 tense-aspect.