Аннотация:The article presents comparative analysis of Russian prepositional units with the noun "лицо" and their functional equivalents in Bulgarian and Ukrainian languages. The present study identifies, distinguishes and describes the three types of correspondences between these units in the languages: (1) the prepositional units are the same in two or in all the three languages; (2) the prepositional units correspond with different prepositional units but with the same meaning; (3) the prepositional units correspond with non-prepositional units bearing the same meaning. These units are distinguished according to the stage of their grammaticization . The forms in the late stage of grammaticization are recommended to be included in the dictionaries as independent dictionary entries and be presented in class by language teachers as prepositions.