The paper presents the classification of verbal derivatives according to 'Aktionsart' in Polish (Verbs containing modificational formatives). In the first part of this paper the main aim is to describe a research project about the semanticderivational category of 'Aktionsarten' in Slavonic languages. The second part of this paper focuses on the characterization of Polish types of verbal action. The term 'types of verbal action' subsumes semantic-derivational classes of verbs distinguished on the basis of modifications in the meanings of verb bases, from the point of view of quantitative characteristics. These derivatives represent the following 'Aktionsarten': temporal, 'Aktionsarten' with the varied degree of intensity and iterative 'Aktionsarten'. Within the scope of particular 'Aktiosarten' the division of derivatives into semantic groups according to the subtypes of 'Aktionsarten' are formal ways of expressing them has been carried out. The article points at the problem of explaining the various meaning of 'Aktionsarten'.
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