Irregular and regular verbs

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Across
  1. 4. past form of clean
  2. 5. past form of write
  3. 7. past form of come
  4. 9. past form of do
  5. 10. past form of stay
  6. 11. past form of forget
  7. 14. past form of teach
  8. 15. past form of watch
Down
  1. 1. past form of know
  2. 2. past form of lay
  3. 3. past form of arrive
  4. 4. past form of cut
  5. 6. past form of say
  6. 8. past form of sing
  7. 10. past form of steal
  8. 12. past form of think
  9. 13. past form of lose