2Chomsky, N. Lectures on Government and Binding[A]. Foris, Dordrecht. 1981. Knowledge of Language: Its Nature, Origin and Use[C]. NY:Praeger,1986.
3Pinker, S. Productivity and conservatism in language acquisition[A]. In W. Demopoulos & A. M Arras (eds.). Language learning and concept acquisition[C]. NJ :Norwood, Ablex, 1986.
4Rutherford, William E. Preemption and the learning of L2 grammar[J]. Studies in Second Language Acquisition.1989(11) :441-457.
5Schachter, J. and Rutherford, W, Discourse functions and language transfer[J]. Working Papers in Bilingualism, 1979(19):3-12.
6Sharwood Smith, Michael. Second Language Learnability[A]. In Roca, I.M. (ed.) 1990. Logical issues in language acquisition[C].Foris, Dordrecht,1990.
7Xu Liejiong & D. Terence Langendoen. Topic structures in Chinese[J]. Language, 1985(61): 1-27.
