a/an, with professions,  the first time we talk about it, = one, once...week periods of time like day, week, year, etc.), twice … month, the, when there’s only one of something: … sun, with superlatives: … best, the second time we speak about it, when we talk about smth specific, (no article), in general (with plural and uncountable nouns), with home, work, school, church, days and months, breakfast, lunch, dinner.

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