A / an, we mention something for the first time / singular nouns, we talk about one of many things, not specific, jobs and professions, exclamaitions (what ....!), expressions of frequency (once ___ week / twice ___ year), to say what kind of thing something is (___ nice dress), The, we've already talked about something, we talk about a unique thing, superlative adjectives, it’s clear from the situation which thing we're talking about, specific groups (___ women in my office), Zero, uncountable nouns, not specific, plural nouns (mentioned in general), home, work, meals (breakfast, lunch, dinner), days and months, before next / last + time, buildings as institutions used for their main purpose (school, university, prison, church, etc.).

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