1Halliday,M.A.K.An Introduction to Functional Grammar[M].Beijing:Foreign Language Teaching and Research Press,1994.
2Lakoff,G.Hedges:a study in meaning criteria and the logic offuzzy concepts[J].Journal of Philosophical Logic,1972(8).
3Brown,P&Levinson,S.Politeness:some universals in languageuse[M].Cambridge:Cambridge University Press,1987.
4Hyland,K.Writing without conviction?Hedging in science re-search articles[J].Applied linguistics,1996(4).
5Markkanen,R&Schroder,H.(Eds).Hedging and discourse:approaches to the analysis of a pragmatic phenomenon in academictexts[C].Berlin:Walter de Gruyter,1997.
6Prince,E.F.,J.Frader,&C.Bosk.On hedging in physiciandiscourse[J].Linguistics and the Professions,1982(6).
7[3]Holmes,G.The Problem of Anglicized French at the University[J].Canadian Modern Review,1977:33,520-524.
8[4]Thompson,G.Introducing Functional Grammar[M].(PP.38) Beijing:Foreign Language Teaching and Research Press; London:Edward Arnold (Publishers) Limited,2000.
9[5][11][15][19][22]M.A.K.Halliday.An Introduction to Functional Grammar[M].Beijing:Foreign Language Teaching and Research Press; London:Edward Arnold (Publishers) Limited,,2000:49,91.