Parts of speech dynamic theory as representation of interaction of thinking, language, and communication

Dynamic theory of the parts of speech system reflects interdependence and interaction between human thinking (reflection) and a language as a representation of this thinking during communication process. This helps to reveal dynamic processes in the parts of speech system and explain from cognitive and communicative viewpoints existence of the system of discourse forms not included into the classification of the parts of speech system. Parts of speech are traditionally looked upon as word classes, i.e. the initial one is a relationship between the part of speech and the conception of the word. In our understanding, the primary one is a relationship of the part of speech not with the word, but with the type of speech, with the nature of world perception. Parts of speech are elements of divisible types of speech. Divisibility of statements is conditioned by the presence of words as language signs in their structure. Further conception of the parts of speech system is developed by taking into consideration differentiation of concepts “word” (lexeme) and “word form” because their functions vary cardinally: “word” (lexeme) objectifies reality, and “word form” - relations between various spheres of this reality. That’s why word forms shouldn’t be included into the classification of the parts of speech system. We consider them cognitive-discursive formations of one word, which are either parts of grammatical categories or represent interaction of various parts of speech in communication process.