Irregular verbs

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Across
  1. 2. the past form of hide
  2. 3. the past form of have
  3. 6. the past form of drink
  4. 7. the past form of know
  5. 8. the past form of choose
  6. 9. the past form of eat
  7. 10. the past form of sleep
  8. 11. the past form of forget
  9. 13. the past form of fell
Down
  1. 1. the past form of understand
  2. 4. the past form of drive
  3. 5. the past form of go
  4. 7. the past form of keep
  5. 8. the past form of cost
  6. 12. the past form of grew