What is the irregular past tense of...?

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Across
  1. 3. make
  2. 4. do/does
  3. 5. see
  4. 7. know
  5. 9. run
  6. 11. think
  7. 13. forget
  8. 14. get
  9. 15. fall
Down
  1. 1. come
  2. 2. say
  3. 4. drink
  4. 6. bring
  5. 8. go/goes
  6. 10. buy
  7. 12. take
  8. 14. give