4Brown,H.D.Teaching by Principles:An Interactive Approach to Language Pedagogy[]..1994
5Poica,T,Holliday,L,Lewis,N,&Morgenthaler L.Comprehensible output as an outcome of linguistic de-mands on the learner studies’[].Second Language Research.1989
6Swain,M,&Lapkin,S.Problems in output and the cognitive processes they generate:a step towards second language learning’[].Applied Linguistics.1995
7Weissberg,B.Speaking of writing:some functions of talk in the ESL compositionclass’[].Journal of Second Language Writing.1994