Take care, Peter. Don't run so fast. Are you tired?
Oh, yes. May I sit on the grass?
No, you mustn't sit on the grass. Don't you see the notes?
Yes, I can see it. But what's on it?
It says ' Keep off the grass! '
Well, there's a bench under the tree. We can sit there.
Be careful. You can't smoke here.
Why not?