Human language is a verbal means of communication; its function consists in forming, storing and exchanging ideas as reflections of reality. Being inseparably connected with the people who create and use it, language is social and psychological by nature (Blokh, 2000).

Language incorporates three constituent parts. They are the phonological system, the lexical system, and the grammatical system. The phonological system determines the material (phonetic) form of its significative units; the lexical system comprises the whole set of nominative means of language (words and stable word-groups); the grammatical system presents the whole set of regularities determining the combination of nominative units in the formation of utterances (Blokh, 2000).

Modern linguistics is essentially based on the systemic conception of language. System in general is defined as a structured set of elements related to one another by a common function.

The interpretation of language as a system develops a number of notions, namely: the notions of language levels and language units, paradigmatic and syntagmatic relations, the notions of form and meaning (function), of synchrony and diachrony, of analysis and synthesis, and some others.

The discrimination of language and speech is the fundamental principle of linguistics. This principle has sustained throughout the whole history of the study of language. With a special demonstrative force it was confirmed by I.A. Beaudoin de Courtenay (end of the XIX c.) and F. de Saussure (beginning of the XX c.) who analyzed the language-speech dichotomy in connection with the problem of identifying the subject of linguistics. The two great scholars emphatically pointed out the difference between synchrony and diachrony stressing the fact that at any stage of its historical evolution language is a synchronic system of meaningful elements, i.e. a system of special signs (Blokh, 2000).

Language vs Speech (verbal behaviour)

Saussure made what became a famous distinction between langue (language) and parole (speech, or verbal behaviour). Language, for Saussure, is the symbolic system through which we . Speech refers to actual utterances. Since we can communicate an infinite number of utterances, it is the system behind them that is important, this is the primary object of study for the linguist. According to F. de Saussure, there is versus . Bylangue, best translated in its technical Saussurean sense as language system, is meant the totality of regularities and patterns of formation that underlie the utterances of a language; by parole, which can be translated as language behaviour, is meant the actual utterances themselves (URL: ht-tps://www.britannica.com/science/linguistics/The-20th-century).

The impact of Saussure's ideas on the development of linguistic theory in the first half of the twentieth century cannot be understated. Two currents of thought emerged independently of each other, one in Europe, and the other in . The results of each incorporated the basic notions of Saussurian thought in forming the central tenets of .

The most important of the various schools of structural linguistics to be found in Europe in the first half of the 20th century included the Prague school, most notably represented by Nikolay Sergeyevich Trubetskoy and Roman Jakobson, both Russian émigrés, and the Copenhagen (or glossematic) school, centred around Louis Hjelmslev (URL: http://www.newworldencyclopedia.org/entry/Ferdinand_de_Saussure).