According to various estimates, there are now from three to seven thousand languages in the world. There can be very significant differences in languages in phonetics, grammar, and vocabulary between languages. But if you look wider, it will become clear that all languages are very similar and subject to description using universal categories.
In this lecture, Elena Gruntova reveals to the students of the Small ShAD the concept of a grammatical category and tells in detail the cases, their nature, types, and also means of expression.
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The lecture is designed for high school students, but goes beyond the school curriculum, so it can be interesting for adults.