Past tense of Irregular verbs

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Across
  1. 1. past tense of know
  2. 4. past tense of go
  3. 5. past tense of pay
  4. 7. past tense of say
  5. 9. past tense of understand
  6. 11. past tense of fly
Down
  1. 2. past tense of write
  2. 3. past tense of hit
  3. 4. past tense of be
  4. 6. past tense of do
  5. 8. past tense of drive
  6. 10. past tense of see