The verbs of the oldest written language in this family were classified into five categories by August Leskien.
The verbs of the oldest written language in this family were classified into five categories by August Leskien. In this language family, the coronal sibilant /s/ is expressed as a velar fricative before semi-vowels like /r/ and velar consonants, rather than being palatalized, in an exception to the RUKI sound law. This family experienced three palatalizations, the last of which did not affect its now-extinct northern dialects, as seen on birch-bark documents. This highly conservative family didn't branch until the 1st millennium CE. It is divided into West, East, and South branches, and its common proto-language is thought to have been the lingua franca of the Avar empire. Languages in this family share many features with Baltic languages, with which it was once thought to form a larger family. For 10 points, name this group of Indo-European languages which encompasses Serbian, Czech, and Russian.
The verbs of the oldest written language in this family were classified into five categories by August Leskien.
Slavic languages [accept South  Slavic or West  Slavic or East  Slavic or even North Slavic; prompt on Balto-Slavic languages or Indo-European languages]