←
Proto-Balto-Slavic *bū́ˀtei (inherited)
←
Proto-Indo-European *bʰuH- (derived)
←
Proto-Indo-European (mention)
←
Proto-Indo-European *h₁es- (derived)
←
Proto-Indo-European *h₁ésmi (mention)
→
Old Church Slavonic бꙑти (cognate)
→
Lithuanian būti (cognate)
→
Latgalian byut (cognate)
→
Latvian esība (mention)