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a book vs an book

The correct phrase is 'a book.' 'A' is used before words that begin with a consonant sound, while 'an' is used before words that begin with a vowel sound.
Michele A. profile picture

Explained by Michele A.
Editor at TextRanch

Last updated: September 13, 2024 • 18457 views

a book

This phrase is correct and commonly used in English.

Use 'a' before words that begin with a consonant sound. In this case, 'book' starts with the consonant sound 'b,' so 'a book' is correct.

Examples:

  • a cat
  • a dog
  • a house
  • a university
  • a one-way street

Alternatives:

  • an interesting book
  • an old book
  • an exciting book
  • an amazing book
  • an incredible book

an book

This phrase is incorrect in English.

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