“grammatical classes‖. He starts from the assumption that what
is traditionally called a part of speech is a type of word, which
grammatically differs from other types of words. [2, p. 68]
It should be noted that the traditional term ―parts of
speech‖ was developed in Ancient Greek linguistics and reflects
the fact that at that time there was no distinction between langua ge
as a system and speech, between the word as a part of an utterance
and the word as a part of lexis. The term ―parts of speech‖ is
accepted by modern linguistics as a conventional, or ―non-
explanatory‖ term (―name-term‖) to denote the lexico- grammatical classes of words correlating with each other in the
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general system of language on the basis of their grammatically relevant properties.
The system of parts of speech is historically changeable,
e.g. articles, modal verbs, statives were not recognized as separate