Beautiful giraffes roam the savannah. (active)
The savannah is roamed by beautiful giraffes. (passive)
Sue changed the flat tire. (active)
The flat tire was changed by Sue. (passive)
We are going to watch a movie tonight. (active)
A movie is going to be watched by us tonight. (passive)
I ran the obstacle course in record time. (active)
The obstacle course was run by me in record time. (passive)
Read more at http://examples.yourdictionary.com/examples-of-active-and-passive-voice.html#i7flGrWr7skIavEE.99