Quote Originally Posted by targajajouka View Post
I'll add that if the word following "a" begins with a vowel (a, e, i, o, u), "an" is used instead of "a".

There's also "an hour" to confuse things....
I never heard this rule before.

What happens if i said "there is a unicorn" - that sounds better than "there is an unicorn" doesn't it?