a/an: when we mention sth for the first time, with singular nouns only, the: when we mention sth for the second time, with singular and plural nouns, when sth is unique , names of the countries with states, federations, kingdoms etc., with group of mountains, islands , names of most newspaper, with places in the city (theatre, cinema), no article: with groups in general , with people's names, with single names of countries , with names of rivers, lakes, single mountains and islands , names of most magazines ,

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