1Biber, D. 1988. Variation across Speech and Writing [M]. Cambridge: CUP.
2Biber, D., S. Johansson, G. Leech, S. Conrad & E. Finegan. 1999. The Longman Grammar of Spoken and Written English [M]. London: Longman.
3Brill, E. 1995. Transformation-based error-driven learning and natural language processing: A case study in part of speech tagging [J]. Computational Linguistics 21 : 543-565.
4McEnery, T. & A. Hardie. 2012. Corpus Linguistics: Method, Theory and Practice[M]. Cambridge: CUP.
5Quirk, R., S. Greenbaum, G. Leech &J. Svartvik. 1985. A Comprehensive Grammar of the English Language [M]. London: Longman.
6Tognini-Bonelli, E. 2001. Corpus Linguistics at Work [M]. Amsterdam: John Benjamins.
