Form
a / an + Singular Countable Noun
(Used for first mentions, jobs, and quantities)
I saw a cat in the garden.
He is an engineer.
Meanings
When to use the indefinite article.
- First time you mention a singular, countable noun:
I have a car and a dog. - To talk about jobs or professions:
She wants to be a doctor. - In certain expressions of quantity:
a lot of, a couple of, a few.