a/an: with professions,  the first time we talk about it, = one, once...week, day, year, twice … month, =per, the: when we talk about smth specific, unique objects, phenomena, with superlatives: … best, the second time we speak about it, musical instruments, Nationalities (sh/ch/ese), (no article): with plural and uncountable nouns, with home, work, school, church, days and months, breakfast, lunch, dinner, sports, games, days, months, years,

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