2Gass, S. & L. Selinker. 2001. Second Language Acquisition: An Introductory Course (2^nd ed ) [ M ]. NJ : Lawrence Erlbaum.
3Larsen—Freeman D 语言教学.从语法到语法技能[M].北京:外语教学与研究出版社,2005..
4Long, M.H. & P. Robinson. 1998. Focus on form: Theory, research, and practice [A]. In C. Doughty & J. Williams (eds.), Focus on Form in Classroom Second Language Acquisition [C]. Cambridge : Cambridge University Press, 16-41.
5Swain, M. 1985. Communicative competence: Some roles of comprehensible input and comprehensible output in its development [A]. In S. Gass & C. Madden (eds.), Input in Second Language Acquisition [C]. Rowley, Mass. : Newbury House, 235-253.
6Swain, M. 1995. Three functions of output in second language learning [A]. In G. Cook & B. Seidlhofer (eds.), Principles and Practice in Applied Linguistics: Studies in Honour of H. G. Widdowson [C]. Oxford: Oxford University Press. 125-14.4.
