根據(jù)語言學(xué)家Stephen Krashen（斯蒂芬·克拉申）的可理解假說，我們是通過理解稍微超出當(dāng)前語言水平的輸入來習(xí)得語言，也就是他理論中的i+1，i代表當(dāng)前語言水平，i+1代表稍微難一點(diǎn)的下一階段，為了能發(fā)展到下一階段，需要理解包含作為下一階段（i+1）一部分結(jié)構(gòu)的輸入語言。
“This hypothesis states simply that we acquire (not learn) language by understanding input that is a little beyond our current level of (acquired) competence.” ；“The input hypothesis states that in order for acquirers to progress to the next stages in the acquisition of the target language, they need to understand input language that includes a structure that is part of the next stage. ”；“To state the hypothesis a bit more formally, an acquirer can "move" from a stage i (where i is the acquirer's level of competence) to a stage i+1(where i+1 is the stage immediately following i along some natural order) by understanding language containing i+1. This technical definition will be of use to us in later discussions.”（P 32）
參考來源：Stephen Krashen, Tracy Terrell, 1983, The Natural Approach
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