Irregular verbs

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Across
  1. 3. past of 'split'
  2. 5. past of 'spread'
  3. 8. past participle of 'keep'
  4. 9. past participle of 'choose'
  5. 13. past of 'become'
  6. 15. past of 'think'
  7. 17. past of 'understand'
  8. 19. past participle of 'go'
  9. 20. past of 'grow'
Down
  1. 1. past of 'lay'
  2. 2. past participle of 'spread'
  3. 4. past participle of 'wake'
  4. 6. past of 'put'
  5. 7. past participle of 'sow'
  6. 10. infinitive of 'hit'
  7. 11. infinitive of 'stung'
  8. 12. infinitive of 'fed'
  9. 14. infinitive of 'cut'
  10. 16. infinitive of 'heard'
  11. 18. past participle of 'swell'