4Levelt, W. J. M. The speaker' s linearization problem [ A ]. In The Psychological Mechanisms of Language [ C ]. The Royal Society and theBritish Academy ,1981.
5Van Dijk ,T. A. Text and Context[ M]. London :Longman, 1977.
6Fillmore, C. J. Pragmatics and the description of discourse [ A ]. In P. Cole (Ed). Radical Pragmatics [ C ]. New York : Academic Press, 1981.