Białoruski i ukraiński wariant prostej mowy XVIII wieku czy białoruska i ukraińska prosta mowa XVIII wieku? (na materiale ruskojęzycznych teologii moralnych z Supraśla, Uniowa i Poczajowa)

The sources of research in this article are the subsequent editions of moral theology published in Ruthenian language / prosta mova printed in basilian typographies in the 18th century. They appeared in various centers: Suprasl, Uniev and Pochaev. The aim of this article is to analyze and compare these texts in terms of occurrence of the Belarusian or Ukrainian language features. The results of the analysis serve as a basis for assessing the quality and character of prosta mova in the eighteenth century