a/an, with singular countable nouns when it is not clear which thing or person is being talked about, the first time something is mentioned, with jobs, when we describe a singular noun ( ___ interesting book), in phrases of quantity or frequency (I work 7 hours __ day), when we mean 'one out of many' (Can I have ___ orange?), the, when the speaker knows which one, e.g. it has been mentioned before, when something is unique (___ sun); superlatives (___ fastest), with some defining expressions (___ only, ___ first, ___ one that), for oceans, rivers, organizations, deserts, mountain ranges, decades, groups of mountains, before the names of the parts of the world ( ___ south), in some phrases with prepositions (in ___ morning, at ___ end), of-case (___ role of education), common places (____ park, ____ sea, ___ theater), when it's clear to the listener/reader what is being talked about (I liked ____ speech you made.), with an adjective or a singular countable noun for things in general ( ___ poor, ___ homeless), no article, with plurals and uncountable nouns to talk about things in general, for continents, countries, states, regions, towns, roads, stations, islands, mountains and lakes, with meals (e.g. ___breakfast, ___ lunch, __dinner) unless we describe them, in some phrases with prepositions (on ___ Monday, on ___ foot), when you use ’s in named possessives (___ John's house), with 'home, work, school, bed, hospital, prison' when we mean that we use this place for some activity, 'next, last, this, that' + time expression (I saw him ___ last Monday), noun + number (Open your books to __ page 15)

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