Since you wanted to practise more Passive voice activities, I have selected this presentation with a short and clear explanation. Then you can have some online practice with the links below. I hope this will help you.
ACTIVITIES
1. Passive Rewrite
2. Passive with TWO objects
3. Causative Passive
4. All passive voice types and exercises
5. Mixed tenses Passive
6. Active or Passive?
7. Causative Passive
8. Impersonal Passives
If you need more practice the net is full of resources for you. I can recommend the websites:
ego4u.com
agendaweb.org
