4Doughty & M. Long. A Handbook of Second Language Acquisition [ M ]. Cambridge : Cambridge University Press, 2003.
5Perera, N.S. The Role of Prefabricated Language in Young Children' s Second Language Acquisition [ D ]. Unpublished Ph. D. Dissertation in Georgetown University, 2001.
6Skehan, P. A Cognitive Approach to Language Learning[ M ]. London: Oxford University Press, 1998.
7Wray, A. Formulaic Language and the Lexicon [ M ]. Cambridge : Cambridge University, 2002.
