VD: Children don't have to/mustn't go to school on Sundays. 1. You had better/ ought take an umbrella. It's raining now. 2. She could/ can speak three languages when she was a girl. 3. He will be able to/ can help you in the future. 4. Shall/Will we go for a walk? - That's a good idea! Will/Shall you open the door for me? 5. 6. The visitors don't have to/ mustn't shout in the museums. 7. We don't have to/ mustn't be late for school. 8. Student' don't have to/mustn't wear uniforms in this school. It's unnecessary. 9. People don't have to/ mustn't tease the animals in the zoo. It's forbidden. 10. You don't have to/ mustn't wait for me if you are in a hurry.