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A or An?

Brought to you by the Purdue University Online Writing Lab


"A" goes before all words that begin with consonants.

with one exception: Use an before unsounded h.

"An" goes before all words that begin with vowels:

with two exceptions: When u makes the same sound as the y in you, or o makes the same sound as w in won, then a is used.

Note: The choice of article is actually based upon the phonetic (sound) quality of the first letter in a word, not on the orthographic (written) representation of the letter. If the first letter makes a vowel-type sound, you use "an"; if the first letter would makes a consonant-type sound, you use "a." So, if you consider the rule from a phonetic perspective, there aren't any exceptions. Since the 'h' hasn't any phonetic representation, no audible sound, in the first exception, the sound that follows the article is a vowel; consequently, 'an' is used. In the second exception, the word-initial 'y' sound (unicorn) is actually a glide [j] phonetically, which has consonantal properties; consequently, it is treated as a consonant, requiring 'a'.

After reviewing this handout, try a practice exercise.

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