1[1]Ellis,R.Understanding Second Language Acquisition[M].Oxford:Oxford University Press.1985
2[2]Ellis,R.The Study of Second Language Acquisition[M].Oxford:Oxford University Press.1994
3[3]Krashen,S.The Input Hypothesis:Issues and Implications[M].London:Longman,1985
4Ellis,R.Instructed Second Language Acquisition[]..1990
5Pienemann.Psychological Constraintson the Teachabilityof Languages[].First and Second Language AcquisitionProcess.1987
6Swain,M.Communicative Competence:Some Roles of Comprehensi-ble Input and Comprehensible Outputin in Its Development[].Input and Second Language Acquisition.1985
7White,Lydia.Second Language Acquisition andUniversal Grammar. Studies in Second Language Acquisition. 12: 121-33 . 1990
8Ellis,R,& X.He.The Role of Modified Input and Output in the Incidental Acquisition of Word Meanings[].Studies in Second Language Acquisition.1999
9Izumi,S,Bigelow,M,Fearnow,S.Testing the output hypothesis:Effects of output on noticing and second language acquisition[].Studies in Second Language Acquisition.1999
10Long,M.H.Does second language instruction make a difference? A Review of Research[].Tesol Quarterly.1983
