This article demonstrates that the Central Stau language (Horpa < Gyalrongic < Sino-Tibetan/Trans-Himalayan) possesses a binary egophoricity contrast in its copular system in affirmative clauses not described and analysed in detail before. It examines the functions of the egophoric copula ŋu and its non-egophoric counterpart ŋə. Of these, the former signals the relevant speech act participant’s personal involvement, epistemic authority or a portrayed stance of a close bond in the proposition. Despite the differences in their functions and differing prototypical domains of use, reflecting patterns of “canonical” egophoricity, the choice between the copulas shows great flexibility and frequently reflects how the speakers wish to encode their epistemic stance. In brief, situation-dependent discourse pragmatics, rather than grammatical person encoded by the copular subject, determines copular use in Stau. The article thus concurs with other recent research on egophoricity that highlights the versatility of this epistemic category.
