The Indefinite Article (a/an)

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)

Not: A water flooded the basement.