Across
- 1. - might, possibly, potentially
- 2. to - need to, must, should
- 3. - have to, need to, should
- 5. to - needed to, was obliged to, must
- 6. - could, might, used to
- 9. have to - needed to, must, was obliged to
- 10. to - should, must, need to
- 12. to - would, formerly
- 13. to - have to, must, should
Down
- 1. - may, could, possibly
- 4. - will, must, ought to
- 6. - shall, going to, intend to
- 7. - would be able to, had the ability to
- 8. - must, ought to, have to
- 11. - able to, have the ability to