Составьте 10 предложений на тему: there is there are и так что бы 3 из них были + 3 - и 4 ?

There is a pen on the desk. There are people in the room. There is a cat on the box. There isn't bag on the chair. There aren't books in the bag. There aren't dolls in the cupboard. There isn't knife on the table. There is dog on the bench. There are man on the bed. There are cafes in the city.