\u27TA/EOSS\u27 Form used for Unrealized Future Events

This paper deals with the unique phenomenon that \u27TA/EOSS\u27 form is used for telling unrealized future events. Such phenomenon could be explained by the concept of \u27mental perfect\u27 which is thought to be a cognitive completion of unrealized events. It further examined the environment which facilitates the introduction of \u27mental perfect\u27 into speech. Another point implied by the results is that the same phenomenon is also found in Korean and the way of recognizing \u27mental perfect\u27 is somewhat different between Japanese and Korean. The allowance range for such usage if Korean seems a little broader than in Japanese