Section outline

  • Use of modal verb 'must':
    To express Examples
    Strong obligation You must wear a helmet while riding a bike.
    Duty The government must give primary education to all children.
    Necessity I must study for the exams.
    You must take your medicines immediately.
    Strong certainty She must have slept as the lights are off.
    Reason behind something He must be happy as he stood first in the class.
    Past action They must have taken the earlier flight.
    Prohibition You must not smoke in the room.
    Must is the strongest model verb of necessity.