Upper Kuskokwim (Athabaskan, Alaska) is a polysynthetic language with morphologically complex verbs involving pronominal affixes denoting clause arguments. One goal of this paper is to see how clauses in this kind of language are organized and operate in conversational discourse. This study is based on a dataset of transcribed conversations, arranged as sequences of elementary discourse units. The issues explored in this article include the structure of clauses, their functioning in discourse, the composition and expression of clause arguments and other participants, as well as an assessment of more and less typical clauses. I find that clauses are strongly aligned with elementary discourse units; that there is a preference for verb-centered, independent, and one-place clauses; and that lexically expressed arguments are rare. Overall, the clause is a viable notion for the description of Upper Kuskokwim conversational discourse. The specifics of clause structure and clause functioning in Upper Kuskokwim can be explained by a combination of general principles of discourse production and the typological features of the language.
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