6Doughty & M. Long. A Handbook of Second Language Acquisition [ M ]. Cambridge : Cambridge University Press, 2003.
7Perera, N.S. The Role of Prefabricated Language in Young Children' s Second Language Acquisition [ D ]. Unpublished Ph. D. Dissertation in Georgetown University, 2001.
8Skehan, P. A Cognitive Approach to Language Learning[ M ]. London: Oxford University Press, 1998.
9Wray, A. Formulaic Language and the Lexicon [ M ]. Cambridge : Cambridge University, 2002.
6Swain,M.Communicative Competence:Some Roles of Comprehensible Input and Comprehensible Output in its Development[M]//S.Gass&G Madden.Rowley.Input in Second Language Acquisition.MA:Newbury House,1985.
7Swain,M.Three Functions of Output in Second Language Learning[C]//In G Cook &B Seidlhofer(eds.).Principles and Practice in Applied Linguistics:Studies in Honour of H G Widdowson.Oxford:Oxford University Press,1995.
