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Indefinite article

The conventional name for the English determiner a or an. We can use a/an to talk about one particular person or thing, when the listener does not which one is meant, or when it does not matter which one.

• John is going out with a German girl.
• Could you give me a pen?
• They have a big house in the city.

We can also use a/an to talk about any one member of a class.

• A spider has eight legs.
• A doctor must like people.