Irregular past tense verbs

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Across
  1. 1. the past tense of swim
  2. 4. the past tense of lose
  3. 6. the past tense of know
  4. 8. the past tense of eat
  5. 10. the past tense of break
  6. 11. the past tense of pay
  7. 12. the past tense of send
  8. 13. the past tense of understand
  9. 17. the past tense of find
Down
  1. 1. the past tense of speak
  2. 2. the past tense of choose
  3. 3. the past tense of hear
  4. 5. the past tense of teach
  5. 7. the past tense of write
  6. 9. the past tense of keep
  7. 14. the past tense of draw
  8. 15. the past tense of drink
  9. 16. the past tense of forget