The irregular verbs

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Across
  1. 3. the past simple and past participle of 'to sell'
  2. 5. the past participle of 'to lie'
  3. 6. the past simple of 'to forget'
  4. 8. the past simple of 'to ride'
  5. 9. the past simple of 'to bid'
  6. 11. the past participle of 'to undertake'
  7. 13. the simple past of 'to swim'
  8. 14. the past participle of 'to wear'
Down
  1. 1. the past participle of 'to lend'
  2. 2. the past simple and past participle of 'to teach'
  3. 4. the past simple of 'to drive'
  4. 5. the past simple and past participle of 'to light'
  5. 7. the past participle of 'to draw'
  6. 10. the past participle of 'to do'
  7. 12. the past participle of 'to rise'