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1. 1.

   Write the sentences, choosing one of the modals.

   1. We are leaving tonight, so you (should/must) buy a ticket for the flight.
      We are leaving tonight, so you must buy a ticket for the flight.
   2. (May/Might) I come in?
   3. David (can/could) cook well when he wants to.
   4. 'Do you think it (can/might) rain?'
      'Yes, possibly. We don't want to get wet so I think we (should/must) take our raincoats.'
   5. Jenny tried to carry him but she (can't/couldn't)
   6. We (can/might) visit my cousin in Australia next year but we don't know yet.
   7. In many countries, you (should/must) wear a seat belt in car. It's the law.
   8. (Can/May) you hold this for me, please?
   9. I know they enjoy their work but they (shouldn't/mustn't) work at the weekends. It's not good for them.
      I think they (should/must) spend time at home with their families.
   10. The letter (can/may) arrive tomorrow.
2. 2.

   Complete the sentences with can, could, may, might, should or must in the positive or negative.

   1. Richard's only three but he can swim very well.
   2. You've had that headache for two days. I think you ____________ go to the doctor.
   3. I don't think we ____________ go to the beach because it ____________ rain this afternoon.
   4. I lived in Germany as a child so I ____________ speak German then, but I ____________ speak it now.
   5. You ____________ remember to take your passport tomorrow.
   6. _____________ you close the door, please?
   7. We _____________ move house next year but we're not sure yet.
   8. Passengers _____________ smoke when the plane is taking off.
   9. I think you _____________ play tennis with Sally. She _____________ play really well.
   10. 'Do you think I _____________ learn some Portuguese before I go to Brazil?' 'Yes, that _____________ be a good idea.'
   11. We ______________ remember to pay this bill before the weekend. It's very important. If we don't, we'll have no electricity.
   12. I know you like sugar but you ______________ eat quite so much. It's bad for you.
   13. I'll be at work on Saturday so I'm afraid I ______________ come to the football match with you.
   14. I was listening very carefully but I _______________ hear what she said.
   15. They don't like living in the countryside. It's too quiet. I think they _______________ move back to the city but they don't agree.