The indefinite article

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A singular countable noun always has an article or another determiner with it.

The indefinite article a/an is used to talk about one particular person or thing when the listener does not know which one is meant, or when it does not matter which one.

A/an is also used to talk about any one member of a class.

Cases where the indefinite article should not be used

With plural and uncountable nouns

The indefinite article cannot used before plural and uncountable nouns.

With possessives

We cannot use the indefinite article with possessives. We use double possessives instead.

With adjectives without nouns

We cannot use the indefinite article with an adjective alone (without a noun).

Sections in this article

Introduction to Articles
The Definite Article
Cases where the definite article should not be used
The Indefinite Article
Cases where articles should not be used
What to use - A/an or the
The difference between some/any and no article
Common expressions without articles
Articles: special rules and exceptions