Englishfor English speakers
a
Determinative
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A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
three
Determiner
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(ordinal third) The number 3.
A triangle has three sides.
three
Noun
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The number 3.
One and two is three.
bagger
Noun
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A bagger is someone who usually puts groceries in bags