6[1]Amy,T.1994.English Conversation[M].London:Oxford University Press.
7[2]Brown,G.& Yule,G.1983.Discourse Analysis[M].Cambridge:Cambridge University Press.
8[3]Hakansson,G.1986.Quantitative studies of teacher talk[A].In Kasper (eds.).Learning,Teaching and Communication in Foreign Language Classroom[M].Aarhus:Aarhus University Press.
9[4]McCarthy,M.1991.Discourse Analysis for Language Teachers[M].Cambridge:Cambridge University Press.
10[5]McCarthy,M.& Carter,R.1994.Language as Discourse:Perspectives for Language Teaching[M].New York:Longman Publishing Company.
