indefinite articles a and an:
there are some exceptions to the rule governing using the a or an before a noun. The general rule is if the next word ( a noun or pronoun) begins with a vowel, then use an.
it is the sound, not the letter that controls what is used. For example, A "u" or "eu" sounded as "y" does not need an an... a unicorn, a European language, a eucalyptus drop.
sometimes "an" is required when the first letter is a silent consonant... "an hour".
also, when an "H" word pronounciation is not on the first syllable, use an:
a history test
an historic event
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