The Role of a Teacher

"He suggests that the right level of input is attained automatically when interlocutors succeed in making themselves understood in communication (Krashen, 1985:2). In his view, the Input Hypothesis is central to all of acquisition, i.e. L2 acquisition depends on comprehensible input. In the classroom, then, the teacher’s main role is to ensure that learners receive comprehensible input by providing them with listening and reading materials. However, a great many researches later challenge his hypothesis by supplying abundant evidence indicating that though necessary, comprehensible input alone is insufficient for L2 acquisition (Swain 1981,1991; Harley & Hart, 1997; Harley & Swain, 1984, etc.). They argue that processing of comprehension is different from processing of production. And the ability to understand meaning conveyed by sentences differs from the ability to use linguistic system to express meaning (Swain, 1985, 1988; Sharwood Smith, 1986; Crookes, 1991). When input is negotiated and learners produce output in interaction, they selectively “take in” portions of comprehensible input and choose correct linguistic form to express themselves. This process makes it possible for the learners to internalize what they have learnt and experienced.
Corder’s distinction between input and intake should be mentioned here. He defines input as what is available to the learner, whereas intake refers to what is actually internalized by the learner (Corder, 1967).This distinction is justified by huge amount of evidence in foreign language learning practice. It is convincingly argued that L2 acquisition will not occur even if with input at the right quantity and quality but without being internalized by the learners and becoming part of their interlanguage system.
On the whole, input is absolutely necessary and there is no theory or approach to SLA that does not recognize the importance of input. In Schwartz’s view (1993), the input feeds or nurtures an innate system to aid its growth. But input alone cannot facilitate second language learning. It will not function to the full in SLA until it gets involved in interaction."