A few stem changers (e>i, o>ue, i>ie, u>ue, e>ie)

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Across
  1. 2. to feel
  2. 5. to cost
  3. 11. to recommend
  4. 12. to resolve
  5. 13. to sleep
  6. 14. to prefer
  7. 16. to begin
  8. 18. to repeat
  9. 19. to fly
  10. 22. to hang (up)
  11. 25. to want
  12. 26. to lie
  13. 28. to think
Down
  1. 1. to have lunch
  2. 2. to suggest
  3. 3. to remember
  4. 4. to follow
  5. 6. to dream
  6. 7. to stumble
  7. 8. to die
  8. 9. to govern
  9. 10. to ask for
  10. 15. to serve
  11. 17. to be able to
  12. 20. to deny
  13. 21. to count
  14. 23. to come
  15. 24. to move
  16. 27. to have