Abstract:

This paper statistically analyzes the auxiliary word “De(的)” in single attributive and explains the causes of errors with theories of SLA.Through research，we believe that errors of “De” are caused by overgeneralization of target language rules and the mother tongue negative transfer.Combining types and various causes of errors，this paper observes that Thai students′ difficulties in the acquisition of “De” mainly consist of the concealing and revealing of “De” when a noun is used as an attributive.

Key words: Thai students, auxiliary word, “De”, error analysis, overgeneralization of target language rules, negative transfer