a / an: when something is not specific or is one of many, to talk about something for the first time, to talk about jobs or hobbies, with singular countable nouns, in exclamations with "What...!", the: with specific things, things the speaker and listener know, with things we've mentioned before, with a specific job only one person can have, with something unique or if there's only one of it, with superlative adjectives, No article: to talk about things in general (plural), before the possessive adjectives (my, your, his, her, its, our, their) , before names and titles, to talk about abstract concepts,

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