Can you put these words in the past tense?

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Across
  1. 2. Find
  2. 4. Buy
  3. 7. Make
  4. 8. Cross
  5. 11. Dance
  6. 13. Lie
  7. 15. Eat
  8. 16. Go
  9. 17. Know
  10. 19. Fly
  11. 20. Give
Down
  1. 1. Jump
  2. 3. Discover
  3. 5. Try
  4. 6. Is
  5. 9. Skip
  6. 10. Do
  7. 12. Cry
  8. 14. Stop
  9. 18. See
  10. 19. Fall