Irregular verbs

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Across
  1. 2. simple past of 'ring'
  2. 3. simple past of 'know'
  3. 8. simple past of 'find'
  4. 10. simple past of 'sleep'
  5. 11. simple past of 'catch'
Down
  1. 1. simple past of 'give'
  2. 4. simple past of 'write'
  3. 5. simple past of 'understand'
  4. 6. simple past of 'forget'
  5. 7. simple past of 'drive'
  6. 9. simple past of 'see'