In this thesis, at first we defined what is lexical-error. And on the base of this definition, we examined problems of lexical-error analyses that had been researched previously. Until now, Many people have studied lexical-error and have classified lexical-error by various ways, but as seeing in view of teaching and learning, there are some problems in those researches. As considering teaching and learning, it is right that lexical error is analysed and classified according to cause of error. So in this view, we suggested a proper type of lexical-error classification. In advance, we also showed how we make lexical error correct by each error type. (Yeungnam University)
