1. we shouldn't eat so much salt.
2. You shouldn't go to that restaurant.
3. The local authorities should help people.
4. We should say thank you more regularly.
5. He should study harder to pass the exam.
6. You should watch that...
7. Should she take a cooking class?
8. you should do it 
9. tourists shouldn't go to that dangerous area
10. she shouldn't complain about her mistakes