The article a becomes to an when the following noun starts with a vowel.

Not a adventure but an adventure.

But how is it, when there's an adjective before the noun?

Not a thrilling adventure or not an thrilling Adventure?

And how is it, when the adjective starts with a vowel but the noun does not?

Not a exciting tournament or not an exciting tournament?

1 Answer 1


A changes to an if the following word begins with a vowel sound. It doesn't matter what part of speech the word is.

Silent letters are ignored. So you say "an hour" because the "o" is a vowel sound after the initial silent "h." Similarly: "an honor, a house."

Note that the "long U" sound, as in *uniform" is not considered a vowel for this purpose, so you'd say "a uniform" but "an ugly duckling."

"Y" and "W", while they typically have vowel sounds, are not considered vowels for this purpose, so you'd say "a yellow flower," "a wish", etc. (There's rare exceptions with words that begin with "Y" that have a "short I" sound, but all such words would be names or scientific words.)

  • You might want to point out that the purpose of the additional "n" is not to confuse learners but to allow for an easier flow of speech. Try saying "a apple" vs. "an apple".
    – Stephie
    Commented Dec 20, 2014 at 16:24
  • +1, but the answer would be improved by including one example with an adjective, confirming not an exciting tournament mentioned by the OP is correct.
    – mins
    Commented Feb 10, 2023 at 17:50

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