In theBulgarian-Polish Comparative Grammar. Volume 7 The Semantic Category of Time , for the first time, many phenomena that have not been noticed and described in previous grammars of the Polish and Bulgarian languages ​​are considered at an academic level. The volumes of the Bulgarian-Polish Comparative Grammar. Volume 7 The Semantic Category of Time are based on logical-mathematical theories: the theory of quantification, the modern theory of processes, known as Petri nets, the theory of logical predicate-argument structures. For the semantic description, a “direct approach to semantics” is used, as is the case in the works of Russell and Burwise and Perry on situational semantics. In volume 7 of the BPSG, the reader will find previously unknown descriptions of lexical, morphological and syntactic means in their capacity as expressions of semantic categories: of time, partly of modality and definiteness/indefiniteness.