If you don´t feel well, you DON´T HAVE TO / SHOULDN´T do physical exercise.
shouldn´t
You MUST / OUGHT TO call an ambulance if you think someone is having a heart attack.
must
If you don´t feel well, you DON´T HAVE TO / MUST go to school.
don´t have to
You DON´T HAVE TO / MUSTN´T cough without covering your mouth.
mustn´t
Your leg is bleeding badly. We OUGHT TO / SHOULDN´T see a doctor.
ought to
You DON´T HAVE TO / MUSTN´T bring your lunch if you don´t want to.
don´t have to
Most of us SHOULD / DON´T HAVE TO drink more water.
should
Doctors say that we OUGHT TO / SHOULDN´T eat five pieces of fruit a day.
ought to