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.
b
Noun
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B is the second letter of the alphabet.
"b" comes after "a" but before "c"
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In some schools, a B is a fairly high grade.
Charles got a B in his maths test.
s
Noun
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The nineteenth (19th) letter of the alphabet.
"s" comes after "r" and before "t"
s
Abbreviation
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S is short for south or southern.