Undefined articles A and an

1. We use a / an with a name or noun to talk about a member of a class

1.1. Carla lives in a nice big house

1.2. My uncle is an engineer

2. The an article is used for nouns or nouns that begin with a vowel.

2.1. a cat

2.2. a chair

3. https://www.youtube.com/watch?v=hg9FcAz7-ag

4. We use a / an when we describe people or things.

4.1. She is a doctor

4.2. My girlfriend is a beautiful woman

4.3. That is an elephant

5. The article a is used for nouns or nouns that begin with consonants

5.1. a crab