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.
vice
Noun
—
A vice is an immoral or bad habit.
Smoking is a vice.
—
A vice is an instrument that consists of two jaws and is closed by a screw or lever. It is used for holding work, such as filing.