a/an, when we say what something is or what somebody does, the first time we mention a thing / person, in exclamations with "What!", in expressions of frequency, the, we've already mention, when it's clear what we're reffering to, when there is only one of something, with places in a town, with superlatives, no article, when we're speaking in general, after "at/to/from" and some nouns (home, work, school), before meals, days, months, before next/last + day, week etc., ..., ////

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