Incheol Choi. 2011. English Causative Alternation and its acquisition by Korean learners. Studies in Modern Grammar 64, 183-210. This paper, building on the result of the corpus study in Choi (2010), reveals that Koran learners rarely overgeneralize the English causative alternation rule and it is mainly due to the lexical conservatism in the sense of Baker (1979). In addition, this paper suggests that Korean learners' acquisition process of the phenomenon is influenced by markedness relation coming from the universal semantic properties and Korean verbal morphological system. To support these conclusions, a grammaticality judgement test and a two-alternative forced choice test were carried out.