Singular and Plural

Singular  - This is a book.
Plural     - These are books.
                I love reading books.

Singular - This is a pencil.
Plural     - These are pencils.
                There are 5 pencils.
                These are color pencils.

Singular - This is a ruler.
Plural    - These are rulers.
               There are 3 rulers.
               These are fancy rulers.

Singular  - This is a flower.
Plural     - These are flowers.
                There are 5 flowers.
                There are 5 lotus flowers on the pond.

Singular - This is a computer.
Plural    - These are computers.
               There are many computers in the lab.
               We can learn many things using the computer labs.