5Hedge T. Teaching and Learning in the Language Classroom[M], Oxford: Oxford University Press, 2000.
6Hymes D, On communicative competence [A]. Pride & Holmes J (eds.). Sociolinguistics[C]. Harmondsworth: Penguin, 1972.
7Hymes D. Foundations in Sociolinguistics: An Ethnographic Approach[M]. Philadelphia: University of Pennsylvania Press, 1974.
8Jones M G & Brader-Araje L. The impact of constructivism on education: Language, discourse, and meaning [J]. American Communication Journal, 2002, 5, 3.
9Piaget J. Biology and Knowledge[M]. Paris: Gallimard, 1967.
10Stern H. Fundamental Concepts of Language Teaching[M]. Oxford: Oxford University Press, 1983.