Englishfor English speakers
a
Determinative
—
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
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
Liberdade
properNoun
—
A Japanese community and district in the subprefecture of Sé, in São Paulo, Brazil.
—
the Japanese community in Brazil
o
Noun
—
The fifteenth (15th) letter of the alphabet. It is a vowel.
"o" comes after "n" and before "p"