5Krashen S. The Input Hypothesis: Issues and Implications [M]. London: Longman, 1985.
6Larsen-Freeman D. Teaching Language : From Grammar to Grammaring [ M ]. Beijing: Foreign Language Teaching and Research Press, 2005.
7Long M. Native speaker/non-native speaker conversation and the negotiation of comprehensible input [ J] plied Linguistics, 1983, (2): 126-141.
8Swain M. Communicative competence: Some roles of comprehensible input and comprehensible output in its development [ A ]. In Gass S & Madden C ( eds. ). Input in Second Language Acquisition [ C ]. Rowley, MA : Newbury House, 1985. 235-253.
9Tyler R W. Basic Principles of Curriculum and Instruction [ M ]. Chicago : The University of Chicago Press, 1949.
