a/an = indefinite article |
1. Indefinite articles are used before nouns which are not defined.
I am reading a book.
His father is a teacher.
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2. If the first letter of the noun is a vowel (a, e, i, o u) we normally use an instead of a.
I am eating an apple.
His father is an English teacher.
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3. Indefinite articles are only used with singular, countable nouns.
I am eating an orange.
BUT
I am eating oranges. (Oranges are plural.)
Would you like a cup of tea?
BUT
Would you like some tea? (Tea is uncountable.)
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