There are many public signs around us. I know a lot about these signs. Some signs have words. Some signs have pictures. Look！ The sign in front of the river means we can’t swim in the river. There is an interesting sign on the wall. It has a big mouth and a f inger. It means we shouldn’t make noise here. There’s a sign on the grass. What does it mean？ Do you know？ Let me tell you. It means we shouldn’t walk on the grass.
　　指导老师：许家红