a/an, when smth is not specific or is one of many, when you first speak about smth, with jobs or hobbies names, with singular countable nouns, in exclamations with "What... !", we can use it instead of per (in meaning of every, each), the, with unique subjects or if there is one of it, with things we have mentioned before, with rivers, oceans, seas, desserts, with specific things, things the speaker and the listener know, with plural names, with superlatives, with adjectives in the meaning of plural nouns denoting categories of people, with public places (cinemas, theaters, museums, galleries etc...), with historical events, -, to talk about things in general, to talk about abstract things, for the names of countries, cities and most other place names

a the zero article

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