A or An

1. A

1.1. Used to before all words beginning with a consonant sound. In English, most words beginning with a consonant will be preceded by the article.

1.1.1. For example

1.1.2. a pet, a door, a green onion, a cat, a hysterical joke.

1.2. It understands that there are some exceptions to this rule. Some words can be written beginning with a vowel, but pronounced with initial consonant sounds. Words beginning with h, y, u

1.2.1. For example

1.2.2. a union, a unicorn, a used napkin, a usability study.

2. An

2.1. Use an before all words that begin with vowel sounds. In English, most words beginning with vowels will be preceded by an article.

2.1.1. For example

2.1.2. an apple, an elbow, an Indian.

2.2. It understands that there are some exceptions to this rule. Some words can be written beginning with a consonant, but are pronounced with initial vowel sound. The words beginning in h are the most common causes of confusion, but there are other letters that can also be challenging.

2.2.1. For example

2.2.2. an hour, an honorable peace, an honest error