In summary the grammar concept often category as such. However, a grammatical concept not only generalise and express from an content. This concept also materialized on the form by a separate format in each language. For example, the noun in English is shown tied to one article (Article): a, an, the; also in French is shown by: le, la, les, ...; in Vietnamese, it is a noun only unit: the, the, the ... (Researchers see the, the, the ... as the article, but we do not see as such, because of the nature of the class quite independent from this one.
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