Can you change these verb to past participle (verb 3)

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Across
  1. 1. send
  2. 2. meet
  3. 4. find
  4. 7. stay
  5. 8. sleep
  6. 10. fall
  7. 11. ride
  8. 12. listen
  9. 14. wash
  10. 18. relax
  11. 19. walk
  12. 20. grew
Down
  1. 1. stand
  2. 3. look
  3. 5. help
  4. 6. wait
  5. 7. study
  6. 9. carry
  7. 13. travel
  8. 15. see
  9. 16. break
  10. 17. leave
  11. 21. run