What is the part of speech of "one day" in the following sentences? And Why don’t we use articles with it?

  • One day a boy started teasing Grady.
  • A lion was asleep in the sun one day.
  • 2
    "One day" plays the role of an adverb, like "today." – user49640 Feb 19 '17 at 19:03
  • 1
    "One day" is a noun phrase consisting of the determinative "one" and the noun "day". The phrase is functioning as an adjunct of time. Since "one" is a determiner marking the phrase as indefinite, there's no need for another determiner like an article. – BillJ Feb 19 '17 at 19:42

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