This is/These are four pencils.
These are four pencils.
This is/These are one pen.
This is one pen.
This is/These are four rubbers.
These are four rubbers.
This is/These are one ruler.
This is one ruler.
This is/These are two books.
These are two books.
This is/These are five crayons.
These are five crayons.
This is/These are one book.
This is one book.
