irregular verbs

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Across
  1. 1. to return
  2. 4. to give
  3. 5. to construct
  4. 11. to play
  5. 12. to hear
  6. 14. to offer
  7. 15. to walk
  8. 17. to ask for
  9. 18. to open
Down
  1. 2. to be (PLACE)
  2. 3. to leave
  3. 6. to follow
  4. 7. to believe
  5. 8. to see
  6. 9. to die
  7. 10. to bring
  8. 13. to go
  9. 16. to sleep