a/an, when we mention sth for the first time, with singular nouns only, with jobs, with adjective + countable noun, the, when we mention sth for the second time, with specific singular and plural nouns, when sth is unique, directions, names of some countries with states, with group of mountains, islands, with nationalities, with the musical instruments, with the superlative form of adjectives, with the ordinal numbers, with names of desertswith abstract, no article, with groups in general (Dogs are smarter than cats), with people's names (Kevin, Sue etc), with countries, with names of rivers, lakes, single mountains and islands (Thames, Como, Everest etc), with abstract nouns, with sport games, with languages ( if there isn't a word' language'), with seasons/month/days of the week

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