A historian is correct. A is for words that start with a consonant sound, such as a bike and a unicorn. Even though unicorn starts with a vowel, it sound like a y. An precedes words with vowel sounds (a, e, i, o, u), such as an apple and an hour -- the h in hour is silent.
|link comment||edited Jan 18 '12 at 12:35 Jody M. Expert|