Turn the present irregular verbs into past irregular verbs

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Across
  1. 2. forget
  2. 4. spell
  3. 8. speak
  4. 9. know
  5. 11. build
  6. 12. drive
  7. 13. leave
  8. 15. find
  9. 17. lose
Down
  1. 1. think
  2. 3. grow
  3. 4. sing
  4. 5. take
  5. 6. eat
  6. 7. go
  7. 10. write
  8. 11. become
  9. 14. teach
  10. 16. drink
  11. 18. swim