This study examines connective endings that are not commonly treated as grammatical markers of aspect in Korean language education. Focusing on the similar grammatical items ‘-go’ and ‘-(eu)myeonseo’, the study analyzes their meanings from the perspective of grammatical aspect and clarifies their aspectual differences. Because ‘-(eu)myeonseo’ requires the same subject in both the preceding and following clauses, the analysis compares it with ‘-go’ in contexts where the same-subject condition is satisfied. When combined with verbs, ‘-go’ can express both resultative and completive meanings, but it conveys a meaning similar to ‘-(eu)myeonseo’ only when it expresses a resultative meaning. With ‘-go’, the first event is completed and its result becomes relevant to the second event, whereas ‘-(eu)myeonseo’ indicates that two events proceed simultaneously without reaching a resulting state. For pedagogical purposes, it is important to explain the distinction between the continuation of a state and the progression of an action, as well as the meanings of simultaneity and sequentiality, in order to clarify the difference between ‘-go’ and ‘-(eu)myeonseo’.

This study was carried out under the premise that lack of grammatical education with overall emphasized fluency is not desirable and the grammatical education can function fully to improve the communicative competence. To support this, the studies that attempted comparative linguistics, universal language theories, and attempts of linguistic typology were examined. However, such efforts are limited in explaining the overall Korean grammatical education systematically. As a method to resolve such problems, a suggestion of actively utilizing grammatical categories were provided. The categorization by grammatical systems is quite familiar since it was applied to all languages for a long time and is a concept that can be usefully utilized in comparative linguistics or linguistic typology. In addition, the overall grammatical factors could be examined systematically. As the meanings, functions, and constraints of combinations among the grammatical factors are compared, which could not be done when examining the individual grammatical factor, the differences can be clearly recognized. This study provided an example of expressing negatives and also suggests the methods to use the grammatical categories for Korean educational grammatical system in the sites of Korean education in detail.