9Crystal, D. The Cambridge Encyclopedia of Language [ M ].Secondedition.外语教学与研究出版社/Cambridge University Press,1997.
10Hasan, R. Ways of Saying : Ways of Meaning: Selected Papers ofRuqaiya Hasan[C]. (Edited by Carmel Cloran, David Butt and Geoffrey Williams), London/New York: Cassel, 1996.