Question

When do you use "a" and "an" before a word?

Answer 1

a before words that starts with constant sound and an before words that starts with vowel sound.

Answer 2

You use an a when the next word doesn't have a vowel at the beginning of a word.

You use an when the next word does have a vowel at the beginning of a word.

Step-by-step explanation:

It's all about grammar and how words go together or don't go together in different ways.