a/an: when we talk about something for the first time, with singular nouns only (a cat, a pen, a knife), with jobs (she is a doctor), the: when we talk about something for the second time, when sth is unique (the Moon, the Earth etc), directions (on the left, on the right, at the corner), names of the countries with states (the USA, the UK etc), no article: with plural nouns in general (Dogs are smarter than cats), with people's names (Kevin, Sue etc), with single names of countries (Ukraine, Uganda, France etc),

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