The Puroik language (previously called Sulung, a derogatory term, by other tribes) is a possible language isolate spoken by the Puroik people of Arunachal Pradesh in India and of Lhünzê County, Tibet, in China.
Those who are literate use either the Bengali-Assamese script, Devanagari or the Latin alphabet to write Puroik.
According to the Ethnologue, Puroik is spoken in 53 villages along the Par River in Arunachal Pradesh.
The internal diversity of Puroik is about equal to that of the Western Kho-Bwa branch.
Lieberherr & Bodt (2017)[4] classify Puroik as Kho-Bwa, and has traditionally been considered to be a Sino-Tibetan language.
Seven cases may be distinguished: Subject (Nominative), Object (Accusative), Instrumental, Dative (Purposive), Ablative, Possessive (Genitive), and Locative.
The three principal tenses (present, past, and future), including the indefinite and the continuous are indicated by means of particles used as suffixes.
Adverbs may be distinguished into four classes: Time, place, manner, and interrogative.