Do you need some extra practice with passive sentences? Here are a bunch of links that will supply you with that «little extra» you need to become a Passive Pro!
Here you have a little warm-up: exercises on ego4u
This exercise is interesting as you have to decide if you may or not omit the agent.
These ones are a bit more difficult, as they are Passive with Reporting verbs. Click HERE to see the exercises.
Finally, how about practising the reverse activity, that is, turning the passive sentences into active? Read the following link.
Remember to leave your comments below: they are an excellent feedback for me!