3Krashen, S. Principles and Practice in Second Language Acquisition [ M]. Oxford : Pergamon Press, 1982.
4Laufer, B. & S. Eliasson. What causes avoidance in L1 learning: L1 - 12 Dilference, L1 - 12 similarity, or 12 complexity? [ J ]. studies in second language acquisition, 1993 (15) : 35-48.
5Schachter, J. An Error in Error Analysis [ J ]. Language Learning, 1974:205-214.
6Schmidt, R. The Role of Consciousness in Second Language Learning [ J]. Applied Linguistics, 1990( 11 ) : 129-158.