How to Use Indefinite Articles “a” and “an”:

If you are using an indefinite article ( “a” or “an”), you have to decide which one to choose based on the sound of the word after.

“a” is used with consonant sounds and “an” is used with vowel sounds.

Examples:
“a”
I bought a bike.
I have a yogurt.
Tony bought a used car.
They built a university near my house.
(A word beginning in “u” sometimes sounds like it begins with “y” which is a consonant sound, therefore you will need to use “a” instead of “an”.

“an”
I have an idea.
I have an ugly sister.
Sheri dated an extremely handsome guy.
What an idiotic mailman!

Remember to think of the SOUND of the word which follows the indefinite article and choosing the correct one will be simple.