puzzle and i dunno

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Across
  1. 2. begin 3rd form
  2. 4. cut 2nd form
  3. 5. fight 2nd form
  4. 6. dream 2nd form
  5. 9. drive 2nd form
  6. 11. fly 3rd form
  7. 12. built 2nd form
Down
  1. 1. keep 2nd form
  2. 3. hang 2nd form
  3. 4. cost 3rd form
  4. 5. forgive 3rd form
  5. 7. wat 2nd form
  6. 8. drink 3rd form
  7. 10. catch 3rd form
  8. 11. fall 2nd form