6Swain, M. Three functions of output in second language learning [A]. In G. Cook & B. Seidlhofer. Principle and Practice in Applied Linguistics[C]. England: Oxford University Press, 1995.
7Gass,S. Integrating research areas: A frame work for second language studies[J]. Applied L inguistics, 1988(9) :198.
8林立,等.第二语言系的研究[M].北京:首都师范大学出版社,2000.12,24.
9Krashen, S. The Input Hypothesis.. Issues and Implications[M]. New York.. Longman, 1985.
10Ellis R. The Study of Second Language Acquisition [M]. Oxford : Oxford University Press, 1994 :47 - 51.
4Patricia A. Porter. An ongoing dialogue: learning logs for teacher preparation[ M]//. In J. C. Richards & D. Nunan (Eds.), Second language teacher education Beijing: Foreign Language Teaching and Research Press,2000:227.
5Carroll D W. Psychology of Language [ M ]. Beijing : Foreign L anguage Teaching and Research Press, 1999:134.
