6Celce-Murcia,M.& E.Olshtain.Discourse and Context in Language Teaching[M].New York:Cambridge University Press,2000.
7Ellis,N.Frequency Effects in Language Processing:A Review with Implications for Theories of Implicit and Explicit Language Acquisition[J].Studies in Second Language Acquisition,2002(24):143-188.
8Ellis,R.Does Form-focused Instruction Affect the Acquisition of Implicit Knowledge?[J].Studies in Second Language Acquisition,2002 (24):223-236.
9Ellis,R.Current Issues in the Teaching of Grammar:An SLA Perspective[J].TESOL Quarterly,2006,40 (1):83-107.
10Graver,B.D.Advanced English Practice[M].Oxford:Oxford University Press,1986.
