5Austin, J. L. How to Do Things with Words[ M]. London: Oxford U- niversity Press, 1962.
6Anderson, J. M. The Grammar of Case: Towards a Localistic Theory [ M]. Cambridge: Cambridge University Press, 1971.
7Biber, D, et al. Longman Grammar of Spoken and Written English [M]. New York: Longman, 1999.
8Bybee, J. L. The semantic development of past tense modals in Eng- lish[A]. In J. Bybee and S. Fleischman(eds. ). Modality in Gram- mar and Discourse[ C]. Amsterdam: John Benjamins, 1995: 503- 517.
9Feng, Z. (封宗信). Hedged fictional propositions and faithful literary translation[J]. Translation Quarterly, 2005(38) : 42-61.
10Fillmore, C. The case for case [ A ]. In E. Bach and R. Harms (eds.). Universals in Linguistic Theory[C]. New York: Holt, Rine- hart, and Winston, 1968: 1-88.