Reflexive constructions in Yaqui

In Yaqui (Uto-Aztecan, Mexico), coreferential participants within the same clause can be expressed by reflexive pronouns or nonreflexive personal pronouns. Reflexive pronouns express agent-patient and agent-beneficiary coreference; when non-coreferential, the patient and the beneficiary take accusative case. Nonreflexive personal pronouns express the coreference between the agent and several other semantic roles (e.g., theme, interlocutor, recipient, source, location); when non-coreferential, these participants take oblique case. The agent-possessor coreference alternates: it is usually expressed by nonreflexive pronouns but, under certain circumstances, it is reflexive-marked. These patterns suggest that the use of reflexive pronouns in Yaqui is syntactically conditioned, i.e., reflexive pronouns cannot be combined with postpositions and cannot serve as adnominal modifiers