7O'Malley, J M & A U.Chamot. Learner Strategies in Second Language AcquJisition{M]. Cambridge: Cambridge University Press, 1990: 26.
8Wenden, A & J Rubin. Learner Strategies in Language Learning[C]//J Rubin.Leamer Strategies:Theoretical Assumptions, Research History and Typology. New York: Prentice Ha11,1987: 19-21.
9Givon,T.Conversation: Cognitive, Communicative and Social Perspective [C]//P Linell & N Korolija.Coherence in Multiple- party Conversation: Episodes and Contexts in Interaction. Amsterdam/Philadelphia: John Benjamins, 1997: 173-174.