DeonSit~Ep: Situational and epistemic necessity are partially distinguished in terms of verbal modality.

(1) jēt-na pelaki wera jol-n ūl-ti wēr-ǝl ū-l.

evening-loc around Vera home-loc be-prs.ptc thing-3sg be-prs.3sg

‘Around the evening time, Vera has being-at-home thing’ =

'In the evening, Vera must be at home.' (the speaker supposes)
'In the evening, Vera has to be at home.' (it’s a rule) (S. O.)

(2) jēt-na pelaki wera-ja jol-n ūl-ti mɔ̄s-l.

evening-loc around Vera-lat home-loc be-inf must/have_to-prs.3sg

‘Around the evening time, Vera has to/must be at home.’ (F. L.)

In Synja Khanty, the expression “somebody has something-doing thing” is used to express epistemic and situational necessity. The mɔ̄s + infinite construction typically denotes situational modality (S.O., F.L) but the topic requires further research.