a/an: when we mention sth for the first time, with singular nouns only, with names of jobs, after "to be", "to have", the: when we mention sth for the second time, with singular and plural nouns, when sth is unique or specific (the Moon, the Earth etc), with musical instruments , when it is clear what we are talking about, period in history, ordinal numbers, superlative forms of adjectives, no article: with groups in general , with people's names, with months, days of the week, cities and most countries, with proper nouns, with languages,

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