A/An: Singular, countable nouns, Mentioning something for the first time, The person/thing is one of a larger number, Professions, A = before consonants, An = before vowels, The: Countable (sing + plural) and uncountable NOUNS, Refering to something previously mentioned, Specific things or people, Something unique, No article: Plural countable nouns, Uncountable nouns when we talk about things in general,

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