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When to use the indefinite article (a/an)

  • You can only use a or an with countable nouns that are singular.
  • You must use a before consonant sounds (a university) and an before vowel sounds (an hour). 
  • You use a/an when you are not referring to a specific person or thing and when talking about jobs or roles (He is a teacher). 
  • You use a/an + noun + of to talk about a unit of something uncountable (a piece of news).

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