Yang Myung-hee. 2003. Error analysis on Demonstratives and Interlanguage Semantics. Korean Semantics, 12. This study aims at revealing a semantic rule of interlanguage through error analysis. To do this we use the corpus of Korean learners whose native language is English. And we analyzed errors on Korean Demonstrative, namely conjunction, demonstrative N-phrase, demonstrative verb, and demonstrative pronoun. Korean learners whose native language is English(abbreviation KLE) have much troubles using conjunction ‘그래서’ of all other conjunctions, and discriminating ‘그/이’ and ‘그런/이런’. It is negative intraligual transfer. KLE use ‘이’ instead of ‘그’, it is negative interlingual trasfer. Repeated systematic observations of a learner's data will remove the ambiguity of a single observation of an error.