Ответ:

  1. I scratched my sister's favourite CD, I wish I hadn't scratched my sister's favourite CD.
  2. I haven't got a motorcycle, I wish I had a motorcycle.
  3. I am not old enough to go to nightclubs. I wish I were old enough to go to nightclubs.
  4. I left school without any qualifications. I wish I hadn't left school without any qualifications.
  5. I missed the plane to Lisbon. I wish I hadn't missed the plane to Lisbon.
  6. I am not tall enough to join the basketball team. I wish I were tall enough to join the basketball team.
  7. I didn't call my grandfather last night. I wish I had called my grandfather last night.
  8. I forgot my parents' anniversary. I wish I hadn't forgotten my parents' anniversary.