4Barnes, S., M. Gutfreud, S. Satterly & G. Wells.Characteristics of adult speech which predict children's language development [J]. Journal of Child Language. 1983 (1) : 65- 84.
5Corder, S. Second language acquisition research and the teaching of grammar [J]. BAAL Newsletter 10, 1980.
6Clahsen, H. & P. Muysken. The UG paradox in L2 acquisition [J]. Second Language Research. 1989 (1): 1 -29.
7HiUes, S. Interlanguage and the pro-drop parameter [J ].Second Language Research. 1986 (1) : 33-52.
8Krashen, S. Second Language Acquisition and Second Language Learning [M]. Oxford: Pergamon. 1981.
9Schachter, J. & Celce-Murcia, M. Some reservations concerning error analysis [J]. TESOL Quarterly. 11:441 - 51.
10Schachter, J. An error in error analysis [J]. Language Learning. 1974 (2) : 205-214.