a/an - We use this with singular countable nouns when we are not talking about a particular thing, or when we mention something for the first time.  , the - We use this with any type of noun when we and our reader/listener know which particular thing we are talking about; it is unique or it has been mentioned before, and with fixed phrases such as in ... 1960s, and some country names., (-) no article - We use this with plural and uncountable nouns to talk about things in general, and with most place names such as continents, countries, cities. ,

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