A characteristic and universal property of natural languages is the use of grammatical morphemes -morphemes which belong to closed classes and exhibit grammatically regular distributional properties -alongside lexical ones. Grammatical morphemes perform a large share of the work of grammar, for perhaps more than distinctive position (word order), grammatical morphology is the major signal of grammatical and discourse structure, as well as temporal and aspectual relations.The formal properties of grammatical morphemes have been wellstudied and a rich terminology has been developed to deal with differences of expression properties. Thus we have
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