Irregular verbs crossword

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Across
  1. 1. Past tense of "know"
  2. 6. Past tense of "become"
  3. 8. Past tense of "eat"
  4. 11. Past tense of "take"
  5. 12. Past tense of "find"
  6. 14. Past tense of "understand"
  7. 15. Past tense of "have"
Down
  1. 2. Past tense of "write"
  2. 3. Past tense of "come"
  3. 4. Past tense of "sleep"
  4. 5. Past participle of "write"
  5. 7. Past participle of "eat"
  6. 9. Past tense of "fight"
  7. 10. Past participle of "do"
  8. 13. Past tense of "do"