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 (the Moon, the Earth etc), directions (on ... left, on ... right, at ... corner), names of the countries with states, federations etc. (the USA, the Russian Federation etc), with group of mountains, islands (... Hawai, ... Alps etc), no article: with groups in general (...dogs are smarter than ...cats), with people's names (...Kevin, ....Sue etc), with single names of countries (....Ukraine,... Uganda, ...France etc), with names of rivers, lakes, single mountains and islands (...Thames, ...Como, ...Everest etc),

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