Regular/irregular verbs in the past

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Across
  1. 5. past simple of the verb buy
  2. 6. past simple of the verb stay*
  3. 9. past simple of the verb study*
  4. 10. =past simple of the verb build
  5. 11. past simple of the verb listen*
  6. 13. past simple of the verb cry*
  7. 17. past simple of the verb draw
  8. 18. past simple of the verb forget
  9. 19. past simple of the verb get
Down
  1. 1. past simple of the verb catch
  2. 2. past simple of the verb like*
  3. 3. past simple of the verb forgive
  4. 4. past simple of the verb come
  5. 7. past simple of the verb burn
  6. 8. past simple of the verb do
  7. 9. past simple of the verb stop*
  8. 10. = past simple of the verb blow
  9. 12. past simple of the verb miss*
  10. 14. = past simple of the verb begin
  11. 15. past simple of the verb fall
  12. 16. = past simple of the verb cost