Надо составить 3 предложения с конструкцией this is и there are

There is a book on the table - There are four books on the table
There is a dog in the garden - There are three dogs in the garden
There is a pencil in the box - There are five pencils in the box
There is a teacher in the classroom - There are teachers in the classroom
There is a ball on the floor - There are two balls on the floor