Irregular past tense verbs

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Across
  1. 2. the past tense of buy
  2. 7. the past tense of speak
  3. 8. the past tense of drink
  4. 11. the past tense of think
  5. 12. the past tense of take
  6. 13. the past tense of stand
  7. 15. the past tense of sleep
Down
  1. 1. the past tense of ring
  2. 3. the past tense of understand
  3. 4. the past tense of keep
  4. 5. the past tense of wake
  5. 6. the past tense of bring
  6. 9. the past tense of write
  7. 10. the past tense of get
  8. 13. the past tense of swim
  9. 14. the past tense of draw
  10. 15. the past tense of say