1. We should invite the Nortons to our party. They are nice people.
2. Young children shouldn't stay at home on their own.
3. Before you go to the dentist's, you should brush your teeth.
4. You mustn't smoke in bed!
5. You should shut the windows because it is raining.
6. You mustn't forget her birthday again.
7. You should go to the theatre when you are in Vienna. It's great.
8. They shouldn't tell her about John's accident. She could break down.
9. You mustn't cross the street when the traffic lights are red.
10. The doctor told Charlie that he shouldn't drink too much alcohol.
первое can't
второе can
третие can