When do you put an in front of a word?

Answer 1

you put an an in front of a word when the word you are putting it in front of starts with a voul.

Answer 2

Use "an" before words that start with a vowel sound, such as "an apple." Use "a" before words that start with a consonant sound, like "a banana." The choice between "a" and "an" depends on the pronunciation of the word, not just its spelling.