5Stalnaker, R. Pragmatic Presupposition [ M ]. New York : New York University Press, 1974:200.
6Verschueren, J. Understanding Pragmatics[ M]. Beijing: Foreign Language Teaching and Research Press, 1999:30.
7Givon T. On Understanding Grammar[ M ]. New York: Academic Press, 1979:29.
8Fillmore C.J. Frames and the semantics of understanding [J]. Quaderni di Semantica, 1985 : 222-- 253.
9Keenan, E. Two Kinds of Presupposition in natural language, in Fillmore,C. & Langendon, T. (eds.) Studies in Linguistic Semantics [C]. New York: Holt, Rinehart & Winston, 1971:45.