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Iquito, a Zaparoan language of Peruvian Amazonia, marks a binary distinction between realis and irrealis clauses solely by means of a word order alternation. Realis clauses exhibit a construction in which no element intervenes between the subject and verb, while in irrealis clauses a phrasal constituent appears between the subject and verb. No free or bound morphology otherwise indicates whether an Iquito clause is realis or irrealis. Based on these facts and partially similar phenomena in other languages, this article argues that typologies of inflectional exponence should be expanded to include word order as an inflectional formative. [ABSTRACT FROM AUTHOR]