The role and the importance of language input in second language acquisition are not questioned. In fact, a pool of researchers in realm second language acquisition agrees on the fact that some sort of language input is necessary for second language acquisition to take place. In other word, second language acquisition cannot take place without considering having exposure to some type of language data. In this relation, pre-modified input, interactionally modified input, and modified output are the three types of language input which have the potential to provide the necessary comprehensible language input for language acquisition/learning. Accordingly, the present paper aims at further investigating the most effective type of language input by considering the amount of contribution that each type of language input has on second language acquisition.
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