1Corder S. P. The Siguificrutce of Learners' Errors. In J.C. Richards (ed.) Error Analysis: Perspectives on Second Lartguage Acquisition. Longman, 1974.
2Declerck R. Is There a Relative Past Tense in English?. Lingua, 1995.
3Dulay H., M.Burt and S.Krashen. Ltmguage Two. New York: Oxford University Press, 1982.
4Ellis R. Second Language Acquisition. Shanghai: Shanghai Foreign Language Education Press, 2000.
5Gui S. & Yang, H. Chinese Learner English Corpus (In Chinese). Shanghai: Shanghai Foreign Language Education Press2003.
6Han B. Statistics in Fareign Language Teaching and Research. (In Chinese). Beijing: Foreign Language Teaching and Research Press, 2000.