a/an: mention sth for the first time, singular countable nouns only, the: mention sth for the second time, singular or plural nouns, sth unique (the Moon, the Earth etc), directions (on the left, on the right, at the corner), names of the countries with states, federations etc. (the USA, the Russian Federation etc), group of mountains, islands (the Hawai, the Alps etc), no article: groups in general (Dogs are smarter than cats), people's names (Kevin, Sue etc), single names of countries (Ukraine, Uganda, France etc), names of lakes, single mountains and islands (Thames, Como, Everest etc),

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