A / an: we mention something for the first time / singular nouns, we talk about one of many things, jobs and professions, exclamaitions (what ....!), expressions of frequency (once ___ week / twice ___ year), to say what kind of thing something is (ex. nice), The: we've already talked about something, we talk about a unique thing, superlative adjectives, places in a city (__ cinema), it’s clear from the situation which thing we're talking about, Zero: uncountable nouns, plural nouns (mentioned in general), special places (home, school), meals (breakfast, lunch, dinner), days and months, before next / last + time,

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