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.
number
Noun
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A symbol that that is used to describe quantity; a numeral.
2, 5589, and 0 are all numbers.
—
A few.
She has a number of dictionaries--four or five, I think.
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A musical, theatrical, or literary selection or production.
She chose a number from "Swan Lake" for her dance recital.
number
Verb
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To label objects with numbers.
Number the baskets so that we can find them easily.
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To total or count; to amount to.
I don’t know how many books are in the library, but they must number in the thousands.
of
Preposition
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Made using.
It is a house of cards.
things
—
noun
any movable possession (especially articles of clothing)
she packed her things and left