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.
promotion
Noun
—
If you get a promotion you move up in rank or position.
He received a promotion to sergeant.
I got a promotion last week from branch manager to regional manager.
—
A promotion gives out information about a product, product line, brand, or company.
The store has a special promotion this week on two-for-one pizzas.