3Krashen, D. Principles and Practices in Second Language Acquisition [ M ]. New York: Prentice Hall, 1987.
4Long, M. Native Speaker/Non -Native Speaker Conversation and Negotiation of Meaning [ J ] Applied Linguistics, 1983.
5Swain, M. Communicative Competence : Some Roles of Comprehensible Input and Comprehensible Comprehensible Output in its Development. [ A ] Gass, S. & Madden, Newbury House, 1985.
6Nunan, D. Communicative Tasks and the Language Curriculum. [ J] TESOL Quarterly, 1991.
7Patricia L. Smith &Tillman J. Ragan. Instruction- al Design ( third edition ) [ M ].华东师范大学出版社,2008.
