(Title in Polish - 'O szczegolnym typie zjawiska kompresji i o interpretacji struktur zdaniowych bedacych jej efektem (na przykladzie jezyka bialoruskiego i jezyka polskiego)). The study raises the issue of the incomplete realization of syntactic-semantic structures in Slavonic languages: in Belarussian, Bulgarian and Polish. The mechanism of syntactic compression, labeled alternatively as syntactic condensation, is perceived as a noncontextual reduction of the direct proposition's predicate position. In the surface structure, this slot is fiiled by one of the arguments. In the research, the linguistic material was studied on the three levels: propositional structures, explication patterns and structural patterns (sentence models). In addition, three factors of sentence compression were investigated: semantic, cultural-cognitive (for exemple, semantic standards), and thematic-rematic (i.e.communicational).