Within this presentation the researcher investigates the grammatical category of MOOD and the markers which have been glossed as such for the Eskimo-Aleut language: Unangam Tunuu. Working within the theoretical framework of Distributed Morphology, and following generative proposals by Han (1998), the author gives particular consideration to the indicative and imperative markers, and proposes that the characteristics of each mood-marker in Unangam Tunuu can be understood through its form, that is, through the syntactic arrangement of the verbal clause. The author further suggests that a mood-marker in Unangam Tunuu includes an operator which minimally consists of two morphosyntactic features: one for directive force and another for irrealis [+/-irrealis].