Помогите надо составить 3 предложения с конструкцией This is и There are

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