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Key to Exercises 1 1. has to 2. must 3. has to 4. have to 5. must 6. have to 7. had to 8. has to 9. had to 10. have to 11. must 12. have to 13. must 14. has to 15. must /have got to
2 1. needn't 2. mustn't 3. mustn't 4. needn't 5. mustn't 6. mustn't 7. needn't 8. mustn't 9. needn't 10. needn't 11. needn't 12. mustn't 13. mustn't 14. needn't 15. mustn't 3 1. must 2. can't 3. needn't 4. must 5. can't/couldn't 6. needn't 7. can't/couldn't 8. must 9. can't 10. needn't 11. must 12. must 13. must 14. needn't 15. needn't |