Idi has elaborate verbal morphology, including complex marking of verbal number.[5] Other noteworthy features, which it shares with other Pahoturi River languages, are the high frequency of analytic constructions (consisting of an uninflecting form plus an inflected auxiliary) in addition to directly inflected verbs, and an elaborate inventory of copulas.[6]
^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Idi language". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
^Evans, Nicholas (2018). "The languages of Southern New Guinea". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. Vol. 4. Berlin: De Gruyter Mouton. pp. 641–774. ISBN978-3-11-028642-7.
^Schokkin, Dineke; Gast, Volker; Evans, Nicholas; Döhler, Christian (2021). "Phonetics and Phonology of Idi". In Lindsey, Kate L.; Schokkin, Dineke (eds.). Phonetic Fieldwork in Southern New Guinea. Language Documentation & Conservation Special Publication No. 24. Honolulu: University of Hawai'i Press. pp. 76–107. hdl:10125/24995. ISBN978-0-9979673-2-6.
^Schokkin, Dineke (2023). "Verbal number in Idi". Studies in Language. 47 (2): 291–317. doi:10.1075/sl.21052.sch.
^Lindsey, Kate Lynn; Schokkin, Dineke; Wu, Nairan (2022). "The Pahoturi River language family, with special reference to its verbal puzzles". Linguistic Typology. doi:10.1515/lingty-2022-2096.