5.不许停放车辆 6. 许多
3.禁止吸烟 4. 不许乱扔垃圾
1.在公园里 2. 在草地上
6. They are watching TV now.(用every Sunday代替now)
5. It means 'Danger'!(对划线部分提问)
4. He sees some public signs in the park.(改为否定句)
3. They mean different things.(改为一般疑问句)
2.That sign means 'Keep off the grass'(改为同义句)
1. He asks Ben some questions about public signs. (转为现在进行时)