irregular verbs

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Across
  1. 4. Base form of made
  2. 5. Past tense of lose
  3. 8. Past tense of ring
  4. 9. Base form of shook
  5. 13. Past tense of write
  6. 15. Past tense of build
  7. 16. Base form of sang
  8. 18. Past tense of think
  9. 19. Past participle of write
Down
  1. 1. Past tense of bring
  2. 2. Base form of stole
  3. 3. Base form of said
  4. 6. Past tense of sink
  5. 7. Past tense of choose
  6. 8. Base form of read
  7. 10. Base form of did
  8. 11. Base form of caught
  9. 12. Past tense of be
  10. 13. past tense of win
  11. 14. Base form of taught
  12. 15. Past tense of buy
  13. 17. Base form of stood