An exploration of Krashen's input hypothesis

In the 1970s and 1980s, American linguist Krashen and Spanish educator Terrell formulated five acquisition hypotheses, with the "i+1" input hypothesis being particularly influential. Krashen's theory emphasizes the significant role of input in second language acquisition and has inspired foreign language education. This paper analyzes the input hypothesis and reviews research on its application in teaching, followed by a discussion of its limitations and use in China's language education.