Shimunek (2017) reconstructs some Tuyuhun words as:[5]
‘second person singular pronoun (爾)’:*čʰɪ [處] (northernEarly Middle Chinese **tśʰɨ); Vovin (2015) reconstructs*čʰo, a 2nd person singular pronoun, equivalent to Mongolicči. The correspondence between /o/ and /i/ is attested between Mongolic and Khitan, cf. WesternMiddle Mongolictaqiya vs. Khitant[i].qo.a.[6]
^Shimunek, Andrew E (2017).Languages of Ancient Southern Mongolia and North China: A Historical-Comparative Study of the Serbi or Xianbei Branch of the Serbi-Mongolic Language Family, with an Analysis of Northeastern Frontier Chinese and Old Tibetan Phonology.doi:10.2307/j.ctvckq4f7.
^Pelliot, Paul. 1921. "Note sur les Tou-yu-houen et les Sou-p'i." T'oung Pao, Second Series, Vol. 20, No. 5 (Dec. 1920 - Dec. 1921), pp.323-331.
^abShimunek, Andrew (2017).Languages of Ancient Southern Mongolia and North China: a Historical-Comparative Study of the Serbi or Xianbei Branch of the Serbi-Mongolic Language Family, with an Analysis of Northeastern Frontier Chinese and Old Tibetan Phonology. Wiesbaden: Harrassowitz Verlag.ISBN978-3-447-10855-3.OCLC993110372.