In the so-called SAE (Standard Average European according to Benjamin Lee Whorf) languages we are accustomed to a certain set of grammatical categories and to a set of their properties one of which is their obligatory aplication. The grammatical categories obviously express a kind of generalized meaning the origin of which is to be looked for in the environmental, social, and cultural reality of a particular linguistic community; however, the original motivation may gradually fade away, become opaque and finally disappear or undergo the process of reinterpretation.
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