Answer Key

Exercise

Say the opposite and fill in the correct form of the modal verb...
  1. I can do it. X I  [can't, cannot] do it.
  2. You mustn't go to the party. X You  [may] go to the party.
  3. They shouldn't think about it. X They  [should] think about it.
  4. She has to pay $1.000. X She  [doesn't have, does not have] to pay $1.000.
  5. We must study hard. X We  [don't have to, do not have to, needn't] study hard.
  6. Amy can't read. X Amy  [can] read.
  7. It may rain. X It  [may not] rain.
  8. We should sleep more. X We  [shouldn't, should not] sleep more.
  9. My mother doesn't have to work every day. X My mother  [has] to work every day.
  10. You may smoke in the building. X You  [mustn't, must not] smoke in the building.