“…Corrective feedback, which plays a scaffolding role in classroom interaction process, has been the focus and prominence of many SLA researchers for the past few decades (Chaudron, 1977(Chaudron, , 1986(Chaudron, , & 1988Doughty, 1994a;Long, 1996;Lyster & Ranta, 1997;Panova & Lyster, 2002;Suzuki, 2004;Li, 2010). Numerous studies, investigating feedback features and effectiveness, derived from Interaction Hypothesis (Long, 1996) which stated that implicit negative feedback, triggering interactional modification, could facilitate learners' comprehension, and Output Hypothesis (Swain, 1985), which asserted that corrective feedback, eliciting modified output, could complete the whole language mastery process.…”