Ответ:

2. Modal Verbs

  1. You mustn't tell lies. It is wrong.
  2. Nelly might be upset. She doesn't listen to us.
  3. You should wear a helmet when riding a motorcycle.
  4. You must think of your eating habits. Eat more fruit and vegetables.
  5. Don't say anything that might hurt your sister.
  6. You shouldn't eat so much ice cream. You might have a sore throat.