a/an: to say what something is or what job people do, e.g. She's _ doctor., in expressions of frequency, e.g. four times _ day, We often use _ the first time we mention a person or thing. e.g. I met _ old friend yesterday., the: when the speaker and hearer know the thing we are talking about, e.g. Close _ window., when there is only one of something, e.g. _internet, _sun, before superlative adjectives, e.g. _best, _most expensive, We use _ the next time we talk about someone/something because it is now clear who/what we are talking about. e.g. _ old friend I told you about is here now., to talk about specific things, e.g. _ coffee in this cafe is really good., no article: when we talk about people or things in general, e.g. I like _ coffee., before possessives, e.g. She's _ my mother's cousin., between have and breakfast, lunch and dinner, in expressions with work, school, university, bed, home etc., by + transport, e.g. go by _ car,

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