Englishfor English speakers
f
Noun
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F is the sixth letter of the alphabet.
"e" comes before "f"
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In some schools, an F is a grade that shows that you have failed completely.
This student has not made any attempt in the exam; he only got an F.
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.