SIMPLE PAST - Regular or irregular?

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Across
  1. 1. Simple past LOSE
  2. 5. Simple past FIND
  3. 6. Simple past MAKE
  4. 7. Simple past DO
  5. 9. Simple past COOK
  6. 10. Simple past BE
  7. 12. Simple past KNOW
  8. 15. Simple past READ
  9. 16. Simple past PLAY
  10. 17. simple past TEACH
  11. 19. Simple past EAT
  12. 22. simple past BUY
  13. 23. Simple past GO
Down
  1. 2. simple past SING
  2. 3. Simple past FORGET
  3. 4. Simple past SAY
  4. 5. Simple past FEEL
  5. 8. Simple past DRINK
  6. 9. Simple past COME
  7. 11. simple past SLEEP
  8. 13. simple past WRITE
  9. 14. Simple past SWIM
  10. 18. Simple past GET
  11. 20. Simple past TEACH
  12. 21. Simple past LOVE