1. AN: Use an when the next word starts with a vowel (a,e,i,o,u) or with a mute h.
1.1. EXAMPLES
1.2. 1-AN HURRICAN
1.3. 2-AN EDGE
1.4. 3-AN ALCOHOLIC PERSON
2. A:Use a when the next word starts with a consonant, or before words starting in u and eu when they sound like you.
2.1. EXAMPLES
2.2. 1-A CLUMSY GIRL
2.3. 2-A GREAT SONG
2.4. 3-A BAD PERSON
3. In English, the two indefinite articles are a and an. Like other articles, indefinite articles are invariable. You use one or the other, depending on the first letter of the word following the article, for pronunciation reasons.
