References
[1]. Biber, D., Johansson, S., Leech, G., Conrad, S., Finegan, E., (2000). Longman Grammar of Spoken and Written English. Beijing: Foreign Language Teaching and Research Press.
[2]. Celce-Murcia, M. & Larsen-Freeman, D., (1999). The grammar book: An ESLIEFL Teacher's Course. (2ed.) Heinle & Heinle Publishers.
[3]. Granger, S., (1998). The computer learner corpus: a versatile new source of data for SLA research. In S. Granger (Ed.), Learner English on Computer. England: Addison Wesley Longman Limited.
[4]. Huddleston, R., (1984). Introduction to the Grammar of English. New York: Cambridge University Press.
[5]. James, C., (1998). Errors in Language Learning and Use: Exploring Error Analysis. Addison Wesley Longman Limited.
[6]. Jespersen, O., (1928). A Modern English Grammar. London: Allen & Unwin.
[7]. Jespersen, O., (1933). Essentials of English Grammar. New York: Holt.
[8]. Li, Wenzhong., (1998). An Analysis of the Lexical Words & Word Combinations in the College Learner English Corpus, PHD dissertation. Shanghaijiaotong University.
[9]. Lyons, J., (1977). Semantics. Cambridge: University Press.
[10]. Quirk, R. Greenbaum, S., Leech, G. & Svartvik, J. (1985). A Comprehensive Grammar of the English Language. London: Longman World Publishing corp.
[11]. Chen, Ping., (1998). Function of English Copular. Fujian Foreign Language, (1).
[12]. Lei, Yaqin., (1995). Summary of Common Copular. Journal of Xinjiang Institute of Education, 11(3), 30-31.
[13]. Liu, Hua., (2004). A Study on the Semantics and usage of the Copular Seem. Foreign Language Teaching and Research, (6).
[14]. Liu, Xingbing., (2005). The Tendency of Spoken Language in Chinese College English Learners' English Writing. Journal of Technology College Education, 24 (1).
[15]. Ning, Ziliang., (2003). Comparative Analysis on Usage of Copular Verbs Look, Seem and Appear. Journal of Shaoyang Institute, (6), 109-110.
[16]. Wang, Rong., (1998). Semantic Classification of English Copular Verbs. Journal of Sichuan Institute of Education, 14(4), 114-118.
[17]. Zhang, Baolin., (2002). Identification Criteria of Copular Verbs. Language Teaching and Research, (4), 50.
[18]. Zhao, Yanchun & Huang, Jianhua., (2001). The Modularity of the English Linking Verbs and Their Syntactic and Semantic Features. Fujian Foreign Language, 68(2), 1-6.
