From Wiktionary, the free dictionary
Compare Kalmyk -в (-v) and Mongolian би (bi).
-би • (-bi)
- First-person singular predicative suffix, used after a consonant.
- Би буряадби. ― Bi burjaadbi. ― I’m a Buryat.
- Украинада түрэһэмби. ― Ukrainada türehembi. ― I was born in Ukraine.
- -б (-b, first-person singular predicative suffix used after a vowel)
- би (bi, “I”, first-person singular subject pronoun)