1Breen M P. Learner Contri but ions to Task Design [ C ]//In Language Learning Tasks. Ed. C and linand Murphy. Englewood Cliffs, N J: Prentice Hall Interna- tional, 1987.
2Donate, Richard. Collective Scaf folding in Second Lan- guage Learning[ C]//In Vygot sky Approach to Second Language Research. Ed. Lan2 to ff, J. et al. New York: Adlex Publisher, 1994.
6Breen, M. P. Learner Contributions to Task Design [A].In Language Learning Tasks [C]. Ed. Candlin and Murphy. Englewood Cliffs, NJ:Prentice Hall International, 1987.
7Donate, Richard. Collective Scaffolding in Second Language Learning [ A]. In Vygotsky Approach to Second Language Research [ C]. Ed. Lantolf, J. et al. New York: Adlex Publisher, 1994.
8Fisher, E. Distinctive Features of Pupil-Pupil Classroom Talk and Their Relationship to Learning: How Discursive Exploration Might be Encouraged [ A ]. In Language, Literacy and Learning in Educational Practice [C]. Ed. Stierer, B. London: The Open University Press, 1994.
9Foster, F. & Skehan, P. The Influence of Planning on Performance in Task-Based Learning [ J ]. Studies in Second Language Acquisition,1996.
10Kumaravadivelu, B. Language-Learning Tasks: Teacher Intention and Learner Interpretation [ J ]. ELT Journal , 1991.
