[1] Bo, B. (2004). An advanced English grammar. Beijing: World Knowledge Press.
[2] Du, Y. (2002). A new complete analysis on English grammar. Beijing: Encyclopedia of China Publishing House.
[3] Longman dictionary of contemporary English (4th ed., 2004). Beijing: Foreign Language and Research Press.
[4] Oxford advanced learner’s English and Chinese dictionary (4th ed., 1997). Beijing: Commercial Press.
[5] Oxford Advanced Learner’s Dictionary of Current English (6th ed., 2004). Beijing: Commercial Press.
[6] Procter, P. (1978). Longman dictionary of contemporary English. London: Longman Group Limited.
[7] Quirk, R., Greenbaum, S., Leech, G., & Svartvik, J. (1985). A comprehensive grammar of the English language. New York: Longman Inc.
[8] Wang, G. D. (2005). Advanced college English grammar. Beijing: Tsinghua University Press.
[9] Zhang, D., & Wen, Z. (1998). A Comprehensive English Grammar. Vol. 1. Beijing: Foreign Language Teaching and Research Press.
[10] Zhang, K. (2005). A new English grammar (2nd ed.). Beijing: Higher Education Press.
[11] Zhang, Z., & Sun, J. (2006). Modern English grammar in use. Beijing: Peking University Press.
[12] Zhang, Z. (1997) A new English grammar (3rd ed.). Shanghai: Shanghai Foreign Language Education Press.