irregular verbs

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Across
  1. 3. draw
  2. 8. write
  3. 11. sit
  4. 12. be in singular
  5. 13. catch
  6. 14. understand
  7. 15. sleep
  8. 17. drive
  9. 18. sing
  10. 20. run
  11. 21. find
Down
  1. 1. dive
  2. 2. have
  3. 4. be in plural
  4. 5. listen
  5. 6. watch
  6. 7. play
  7. 9. teach
  8. 10. visit
  9. 15. swim
  10. 16. hear
  11. 19. know