1Canale, M. & M. Swain. Theoretical Bases of Communicative Approaches to Seeond-Language Teaching and Testing [J ]. Applied Linguistics 1/1: 1-47. 1980.
2Chomsky, N. Aspects of the Thoery of Synttax [M]. Cambridge,Mass: The MIT press. 1965.
3Hymes, D. On Communicative Competence. In Pride & Holmes (eds.), Sociolinguistics [ C]. Harmondsworth: Penguin. 1972.