Ответ:
1. – Must I pay right now?
– No, you aren't. You can do it later.
2. The tablets need to be taken three times a day.
3. Sarah needs to do her homework before she goes to her dance class.
4. The President needs to visit Italy every week.
5. I don't think he needs to explain the situation, we quite understand the problem.
6. How awful, she says she needs me anymore!
7. Dogs need to be kept off the grass.
8. I know she needs your help.