3Halliday M. Learning How to Mean [ M ]. London: Edward Arnold, 1973.
4Richards J and Rodgers T. Approaches and Methods in Language Teaching[M]. CUP, 1986,
5Skehan P. Interlanguage development and taskbased learning [ A]. Bygate M et al. Grammar and the Language Teacher [C]. Hemel Hempstead: Prentice Hall, 1994. 175-199.
6Long M. Instructed intedanguage development[A]. Beebe L. Issues in Second Language Acquisition: Multiple Perspectives [C]. Rowley,Mass : Newbury House, 1988.
7Schmidt R. The role of consciousness in second language learning [ J ]. Applied Linguistics,1990, 11(2):129-158.
8Willis J. A holistic approach to task-based course design. Online, 2000.
9Cunningsworth A. Choosing Your Coursebook [M]. Oxford:Heinemann, 1995. 31- 32.
10Krashen S. Principles and Practice in Second Language Acquisition [M]. Oxford: Pergamon, 1982.
