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Use of a/an
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a is used before a word beginning with a consonant,
or a vowel with a consonat sound:
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a tree
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a big house
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a noisy street
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a utensil
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an is used before words beginning with a vowel
or words beginning with a mute h:
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an apple
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an egg
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an inspector
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an hour
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an is also used before individual letters spoken with
a vowel sound:
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an MP
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an SOS
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Omission of a/an
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Before plural nouns:
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an apple -> apples
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an hour -> hours
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Before some uncountable nouns which use some, any, no or a little:
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I want some tea
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I don't want any help
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