a/an, when we mention sth for the first time, with singular countable nouns , with jobs, when we describe smth , have adjectives, the, when we mention sth for the second time, when sth is unique (Moon, Earth etc), with singular and plural nouns, names of the countries with states, federations etc. (the USA, the Russian Federation etc), with group of mountains, islands (Hawai, Alps etc), with superlative adjectives , with musical instruments , with names of seas , oceans , rivers 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 lakes, single mountains and islands (Thames, Como, Everest etc), with roads , streets , parks .

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