a/an: when we mention sth for the first time, non-specific singular countable nouns, jobs and nouns of nationality, 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 the left, on the right, at the corner), names of the countries with states, federations etc. (the USA, the Netherlands etc), groups of people, the superlative form of adjectives, no article: with people's names (Kevin, Sue etc), with single names of countries (Ukraine, Uganda, France etc), general plural and uncountable nouns, in certain prepositional phrases (at home, at university, at work, by train),

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