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The goal of this research was to show meaning of Korean interrogative sentence final endings ‘-nunka/(u)nka’, ‘-na’, and ‘-(u)lkka’ and discourse function of interrogative sentences with these endings in academic texts. In order to accomplish this goal, this paper analyzed their usage in academic texts which were extracted from Modern Korean Written Corpus of the 21st Century Sejong Project Corpus. These academic texts are composed of about 1 million words. The findings of data analysis showed that ‘-nunka/(u)nka’ and ‘-na’ were used for unmarked question while ‘-(u)lkka’ was used for asking hearer’s presumption in academic texts. A few of ‘-nunka/(u)nka’, ‘-na’, and ‘-(u)lkka’ in academic texts were used for self-question as in spoken Korean. In the aspect of discourse function, interrogative sentences with ‘-nunka/(u)nka’, ‘-na’, or ‘-(u)lkka’ were used for attracting readers’ attention and improving their text acceptability in common. In detail, they were used for suggesting topics in forms of raising questions, inducing active involvement of readers, and suggesting objectified questions in academic texts.
