Radical Stem Changers

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Across
  1. 3. I did
  2. 7. I was
  3. 9. wewanted
  4. 10. you had
  5. 12. you were
  6. 13. he/she did
  7. 15. we did
  8. 16. they had
  9. 18. they said
Down
  1. 1. you said
  2. 2. we said
  3. 4. we were
  4. 5. you did
  5. 6. they did
  6. 7. they were
  7. 8. he/she was
  8. 11. I said
  9. 14. I wanted
  10. 16. I had
  11. 17. he/she said