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A, An, The. They precede the nouns and are used inundefined expressions.
A/ an is used only with countable singular nouns. Those
who start with the consonant letter have "a" tag at the
beginning of the word, and nouns that begin with a vowel
that will have "an" tag at the beginning of the word.
A/ an is usually used when expressing what an object is.
We cannot use countable singular nouns alone.
Examples
- Alex is training to be an
engineer.
- I need a kilogram of
- I saw an accident of a
car.
1 That is an excellent
pencil.
salt.
If we are talking about a specific object, "the" is
used. Countable singular or plural and can be used with
all uncountable nouns.
If we are talking about an unknown object or person a /
an, but if specified, " the" is used.
Examples
- The movie is perfect.

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