The purpose of this study is to investigate the errors concerning V-ing forms in Korean college freshmen’s English essays in order to provide some guidelines for teaching the forms effectively. The data for this study were retrieved from a learner corpus consisting of 815 essays written by Korean college freshmen. A total of 3,843 words were found in the form of V-ing, which were categorized according to their roles as follows: (a) present participles (1,235 tokens), (b) gerunds (2,591 tokens), and (c) unclear cases (17 tokens). Of the 3,843 forms of V-ing, a total of 292 tokens were classified as erroneous, 137 of which were participle-related errors and 138 gerundrelated errors. The most frequently occurring errors under the categories of present participles and gerunds were the use of a present particle without a main verb (64.2%) (e.g. I *looking for the meaning of the building’s name) and to-infinitive related errors (66.7%) (e.g. Therefore, we try to *changing our college’s image), respectively. Pedagogical suggestions based on the findings of the study are also provided at the end.