Review.

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Across
  1. 1. : Past simple auxiliary used in questions/negatives.
  2. 3. : Past simple of "buy".
  3. 5. : Past participle of "see".
  4. 8. : Past participle of "make".
  5. 10. : Present simple of "play" for he/she/it.
  6. 12. : Base form of "to go".
  7. 13. : Present simple of "to be" (plural).
  8. 14. : Comparative of "good".
  9. 16. Likes to chase mice
  10. 17. : Comparative of "bad".
  11. 19. : Present simple of "to be" (he/she/it).
Down
  1. 2. Man's best friend
  2. 4. : Present perfect auxiliary for I/you/we/they.
  3. 6. Has a trunk
  4. 7. : Present perfect auxiliary for he/she/it.
  5. 9. Large marsupial
  6. 11. : Past participle of "go".
  7. 14. Flying mammal
  8. 15. : Past simple of "go".
  9. 18. : Present simple of "run" for he/she/it.