It is Saturday afternoon. Peter and his friends David are taking a walk in the park. There are many public signs in it. They mean different things. Peter knows a lot about them. Suddenly, they see a short man walking on the grass.
Peter points to the sign on the grass and says to him: " Sir,look at the sign. It says ‘ Don't walk on the grass.' You walk on the grass." The man smiles and says, "You are right, young man .But I am the park keeper . I am looking
after the grass."
