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Determiners - A , An or The

When to use A, An or The?

Definite Article - "The" is a definite article, which means that it is used to specify something specific. It refers to a noun the is either understood (by the reader or listener) or has been previously referred to by the writer or speaker.

Indefinite Articles - "A" and "An" are indefinite articles. The difference between "A" and "An". "An":is used is it comes after a word that starts with a vowel.

"A" and "an" are used the same way grammatically. They are used before a singular noun, or before the adjective the represents the noun. They can't be used with plural nouns or uncountable nouns.

Examples

A/An

There is a dog outside the building.

We don't know which dog the writer/speaker is referring to.

The

The black dog is outside the building.

It is understood to which dog the writer/speaker is referring to

A/An

Do you know where there is a post office?

The writer/speaker is not referring to a specific post office

The

I am going to the post office.

It is understood to which post office the speaker/writer is referring to.