作者单位：李富强（电子科技大学外国语学院,四川,成都,610054）
参考文献：
[1]Bodman,J.,and M.Eisenstein.1988.' May god increase your bounty:The expression of gratitude in English by native and nonnative speakers.' Cross Currents.
[2]Kasper,G.(2001).Four perspectives on L2 pragmatic development.Applied Linguistics.
[3]Salsbury,T.and K.Bardovi-Harlig.2000.' Oppositional talk and the acquisition of modality in L2 English' in B.Swierzbin,F.Morris,M.Anderson,C.A.Klee,and E.Tarone (Eds.):Social and Cognitive Factors in Second Language Acquisition.Somerville,MA:Casadilla Press.
[4]Schmidt,R.1983.' Interaction,acculturation and the acquisition of communicative competence' in N.Wolfson and E.Judd (Eds.):Sociolinguistics and Second Language Acquisition.Rowley,MA:Newbury House.
