Past Tenses: What is the past tense of each word?

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Across
  1. 3. build
  2. 4. camp
  3. 6. sunbathe
  4. 8. sleep
  5. 9. vacation
  6. 11. singing
  7. 12. hike
  8. 13. go
Down
  1. 1. pitch
  2. 2. ride
  3. 3. bring
  4. 5. rafting
  5. 6. swim
  6. 7. play
  7. 10. catch