1Swain. Three functions of output in second language learning [A]. In G. Cook&B. Seidelhofer (eds.). Principle and Practice in Applied Linguistics [ C ]. Oxford: OUP. 1995.
2Long, M. H. Native speaker/non - native speaker conversation and the conversation of comprehension input [J]. Applied Linguistics 4/2, 1983.
3Vygotsky, L. S. Mind in Society: The Development of Psychological Process [M]. Cambridge, MA: Harvard University Press, 1978.
4Lyster, R. &Ranta, L. Corrective feedback and learner uptake: negotiation of form in communitive classrooms [J]. Sdudies in Second Language Acquisition 19, 1997: 37- 66.
5Long, M. H. The role of the linguistics environment in second language acquisition [A]. In W. C. Ritchie&T. K. Bhatia (eds.). Handbook of Second Language Acquisition [C]. San Diego: Academic Press, 1996.