This page will teach you when and how to use the indefinite article (a/an).
We use the indefinite article when…
1- We mention a noun for the first time.
I saw an accident on the way to work today.
2- Which noun is unknown or unimportant.
He bought a coffee at the restaurant.
3- We are talking about titles of professions and jobs
She’s an architect.
Is he a teacher?
4- To show that a person or thing is part of a group.
He’s a member of the worker’s union.
* Note: We only use the indefinite article with singular countable nouns.
I ate a banana. (singular)
Not: I ate
a bananas. (plural)
Water flooded the basement. (uncountable)
A water flooded the basement.