Irregular past tense

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Across
  1. 1. say
  2. 3. stand
  3. 4. go
  4. 8. speak
  5. 9. sing
  6. 10. eat
  7. 11. think
  8. 15. build
  9. 16. come
  10. 18. draw
  11. 19. drink
  12. 20. give
  13. 23. write
Down
  1. 2. drive
  2. 3. see
  3. 5. take
  4. 6. feel
  5. 7. sing
  6. 8. sleep
  7. 12. hear
  8. 13. tell
  9. 14. fly
  10. 17. understand
  11. 21. know
  12. 22. swim