singular, plural and possessive nouns

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Across
  1. 2. the singular of knives
  2. 6. the singular of feet
  3. 7. the plural of story
  4. 8. plural of ox
  5. 10. a plural possessive noun
  6. 12. this remains the same singular and plural
Down
  1. 1. plural of animal
  2. 3. the plural of roof
  3. 4. plural of child
  4. 5. a singular possessive noun
  5. 9. the singular of men
  6. 11. plural of tooth