The article adopts functional grammar approach to consider the issues of intercategorical interaction in the categorical semantic complex. The aim is to describe the functional potential of Russian interjections and 194 interjectional phraseological units (IPU) in intercategorical interaction actualized in emotiveexpressivecausative categorical semantic complex. The study applies corpus method, continuous sampling, directed sampling, contextual analysis, component analysis and classification. The obtained results indicate that being expressive by nature, interjections and IPUs actualize the pragmatic category of expressivity in the complex giving grounds to define such a complex as emotiveexpressivecausative complex. The functional features of IPUs include polysemy, brightly expressed emotivity, stability and reproducibility in speech. These units, belonging to the sphere of phraseology, may have national specifics enhancing their expressive nature. The peculiarity of the emotiveexpressivecausative complex is determined by the fact that the functionalsemantic categories of causation and emotivity interact with the category of expressivity which, appealing to the addressee, belongs to subjectivepragmatic categories. The main function of expressivity is an increased impact on the recipient to evoke an emotional response, and the major expressive means here are IPUs. The analysis of 80 interjections and 183 IPUs functioning patterns in various contexts enabled to arrange them into 2 classes: one with positive semantics and another with negative semantics both being represented by similar subclasses: admiration, surprise, quietness, etc., vs scorn, indignation, threat, etc.
Siutkina et al. (2024) studied this question.