There is twelve pens.

There are twelve pens.

There twelve pens.

There are one dog.

There is one dog.

There is one dogs.

There four students.

There is four students.

There are four students.

There are six families.

There is six families,

There are six familys.

There is one bags.

There are one bag.

There is one bag.

There are five bags.

There is five bags.

There are five bag.

There are one bird.

There is one bird.

There is one birds.