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.
bigger
—
adjective
large or big relative to something else
bang
Noun
—
A bang is a short loud noise like the sound of a door closing or a gun being shot.
The two cars hit with a big bang.