“… ‘comprehensible input’ is the crucial and necessary ingredient for the acquisition of language.”
Stephen Krashen
REFERENCE
SHÜTZ, Ricardo. Stephen Krashen’s Theory of Second Language Acquisition. April 1998. Available on: <https://www.sk.com.br/sk-krash.html> Access on Nov 24th, 2018.
Krashen's Second Language Acquisition Theory 