Research of the Application of the “i+1” Language Input Method in IELTS Listening on Unlock 4 Listening

This study explores the application of Krashen’s i+1 Language Input Method in IELTS listening instruction through a case study of Unlock 4 Listening Teaching. “I” represents the level of the learner’s existing second language, and 1 represents a language material that is slightly higher than the current level of the learners. Building on the theory that language acquisition is most effective when input slightly exceeds learners’ current proficiency, this research investigates whether structured i+1 input can enhance students’ listening comprehension and learning motivation. The study involved an experimental and a control class of Chinese students in a Beijing university’s preparatory program. Through questionnaires, pre-tests and post-tests, and targeted listening activities, findings revealed that the i+1 method significantly improved students’ IELTS listening skills and boosted their confidence and interest in listening tasks. The results suggest that integrating i+1 input in curriculum design fosters more effective and engaging listening instruction. Therefore, the i+1 language input method has obvious effects in teaching applications.