Irregular verbs

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Across
  1. 2. - know - knew - ...
  2. 4. blow - ... - blown
  3. 5. leave - ... - ...
  4. 8. catch - ... - ...
  5. 9. teach - ... - ...
  6. 11. sing - sang - ...
Down
  1. 1. fly - flew - ...
  2. 2. keep - ... - ...
  3. 3. think - ... - ...
  4. 4. buy - ... - ...
  5. 5. light - ... - ...
  6. 6. find - ... - ...
  7. 7. ring - ... - rung
  8. 10. hang - ... - ...