a/an: before jobs, nationalities and religions, to talk about something for the first time (singular countable nouns), in measurements and frequency expressions ( as well as "per"), the: there is only one of something, when our partner knows what we are talking about ( has been mentioned before), superlative adjectives and ordinal numbers, with an adjective to refer to a group of people (rich, unemployed), countries with plural names, containing "republic", "kingdom" etc, water names, groups of islands and mountainscountries with plural names, containing "republic", "kingdom" etc, No article: plural or uncountable nouns in general way, most company names, days, dates,months, years , some festivals, most countries, proper names and cities,

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