A/an, to talk about one person or thing in general., to say a person or thing is one of many., when we first mention something., Zero article, to talk about people or things in a general way., before certain generally familiar places (school, work, hospital, university)., The, to talk about a specific person/people or thing(s)., when we refer back to a person/people or thing(s) already mentioned., before a superlative adjective..

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