When you are talking about one person, animal, place, or thing, use a singular noun.

Use a before words beginning with the other letters of the alphabet, called consonants. For example:

Use a or an before singular nouns. Use an before words behining with vowels (a, e, i, o, u). For example:

Some Words don't follow this rule. For example, use a (not an) before these words that begin with u:

Some Words don't follow this rule. For example, use an (not a) before these words that beging with h: