3Long,M.H.Native speaker/non-native speaker conversation and the negotiation of comprehensible input.Applied Linguistics,1983(4):126-141.
4Lyster,R.& Ranta,L.Corrective feedback and learner uptake:Negotiation of form in communicative classrooms.Studies in Second Language Acquisition,1997(19):37-66.
5Schmidt,R.and S.Frota.Developing basic conversational ability in a second language:a case-study of an adult learner.In Day.(Ed.):Talking to learn:Conversation in Second Language Acquisition,1986:237-326.Rowley,Mass:Newbury House.
6Chaudron,C.A descriptive model of discourse in the corrective treatment of learners' errors.Language Learning,1997(27):29-46.
7Chaudron,C.Second language classroom:Research on teaching and learning.Cambridge:Cambridge University Press,1988.
8Ellis,R.Contextual variability in second language acquisition and the relevancy of language teaching.In Ellis,R.(Ed.):Second Language Acquisition in Context,1987:179-194.Prentice Hall,International.
9Hendrickson,M.Error correction in foreign language teaching:recent theory,research,and practice.Modem Language Journal,1978(62):387-398.
10Krashen,S.Principles and practice in second language acquisition.Oxford:Pergamon,1982.
