1. We don't have to go, it's optional.
2. You mustn't drive on this medica
tion.
3. It's free! You don't have to pay!
4. They mustn't come, but it will be fun!
5. You mustn't feed the dog, he's not well.
6. He doesn't have to go to work today because he finished his project.
7. You don't have to work after your operation.
8. We mustn't go in there, it's private.
