Grammatical works of the end XVI – early XVII c. is the first recorded attempt to codify the rules of Church Slavonic of Russian edition, to bring into system a certain «discrepancies» in paradigms of words and to consolidate their understanding of the Church Slavonic norm of that period. The practical aim was to give study books for the Church Slavonic grammar schools and copyists and translators. In the first half of the XVI century along with grammary, was another source – the grammatical discourse concerning the Latin translation of grammatical theories; translation of the Latin grammar books and the attempts to adapt the Old Russian language theories to the Latin language, as well as understand the Russian language through the category of Latin grammar. Description of the grammatical rules of the use of forms of verbal in the end of XVI – early XVII c. is based on three grammars study material characterized by systematic exposition of grammatical material – Adelfotes (1591), Grammar of Lavrenty Zizaniy (1596) and Grammar of Melety Smotritsky (1619 and 1648).