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The AMA Handbook of Business Writing by Jennifer WAUSON, Kevin WILSON

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A

A, AN

A and an are articles that proceed and identify nouns. A and an can also be used to mean one of something. The choice of a or an before a noun is based on the phonetic sound of the first letter in the word, not the written letter.

Image A is used before all words that begin with consonants.

Example: a kite, a man, a tomato, a large apple

Exception: An is used before words that begin with an unsounded h.

Example: an honor, an honest mistake

Image An is used before all words that begin with vowels.

Example: an apple, an egg, an Italian, an onion, ...

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