Imperfect forms of possum

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Across
  1. 3. These three letters denote the imperfect in forms of sum,esse
  2. 5. Imperfect tense used to describe ___ actions
  3. 6. These to letter denotes the Imperfect tense
  4. 7. first person singular Imperfect form of possum
  5. 10. meaning of poteratis
  6. 12. Which tense translates as "was/were verbing"?
  7. 13. second person plural imperfect form of possum
  8. 14. meaning of poteram
Down
  1. 1. third person singular Imperfect form of possum
  2. 2. third person plural Imperfect form of possum
  3. 4. meaning of poterat
  4. 5. meaning of possum (hint: two words slash between them)
  5. 8. First person plural Imperfect form of possum
  6. 9. second person singular Imperfect form of possum
  7. 11. Imperfect tense is a _______ tense