1. Can be singular or plural (simply add an “-s" or “-es").
I have one pencil.
I have two pencils.
2. Can take a singular or plural verb (make sure they agree).
This book is interesting.
These books are interesting.
3. Can be preceded by a number: one, five, etc.
One student works hard.
Five students work hard.
4. Can be preceded by “the," “a," and “ an."
The glass is broken.
A glass is broken.
5. Cannot be without an article, number, or expression, if they are singular.
Student works hard. (incorrect)
A student works hard.
One student works hard.
The student works hard.
Many students work hard.
6. Can be alone if they are plural.
Sample Usage
Students work hard.
Books are interesting.
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