Stem changing verbs

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Across
  1. 6. we read
  2. 8. you sleep
  3. 9. they sing
  4. 13. I play (as in a sport)
  5. 14. she walks
  6. 16. we watch
  7. 17. I want
  8. 18. they prefer
  9. 19. you draw
  10. 21. we do
Down
  1. 1. they can
  2. 2. they lift
  3. 3. we can
  4. 4. he paints
  5. 5. he plays (as in a sport)
  6. 7. we dance
  7. 10. they want
  8. 11. we sleep
  9. 12. he prefers
  10. 15. I prefer
  11. 20. you use