The Articles
A and An

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.  

Use "an" with words that start with a vowel sound.

     *An Apple

     *An Indian

     *An Egg

Use "a" with words that start with a consonant sound.

     *A Purple Onion

     *A Buffalo

     *A square

Hold up! You're not an expert at this yet.  

Exceptions:

An is used before an unsounded "h" This means that is the "h" is not heard in the word you use An instead of A.

     *An honest error

     *An honorable surrender

A is used when "u" makes the tame sound as the " y" in "you" and "o" makes the same sound as "w" in "won"

     *A unicorn

     *A used napkin

     *A U.S. flag

     *A one-legged man

     

https://owl.english.purdue.edu/owl/resource/591/1/

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