DeonSitNonEp: Situational and epistemic necessity are totally distinguished in terms of verbal modality.
(1) īttən wēra-ɣa jaqə-n waʌ-taɣə mɔ̄s-ʌ.
evening Vera-lat home-loc be-inf must/have_to-prs.3sg
‘Vera has to be at home in the evening.’ (L. N. K.)
(2) īttən wēra ńīči jaqə-n waʌ-ʌ.
evening Vera probably home-loc be-prs.3sg
‘Vera should be home in the evening = She is likely to be home in the evening’ (L. N. K.)
In Surgut Khanty, situational necessity is expressed by the auxiliary mɔ̄s- ‘must/have to’ and the infinitive of the main verb (1). Epistemic modality is expressed by adverbs (2).