Okay, cringey video, but some good advice and interactive practice to help get to grips with the passive form. It's very easy in fact -- it's just a verb form! -- as long as you don't try to make sense of it through the everyday meaning of the word 'passive', or try to take short-cuts in identifying it.
The page here helpfully discusses alternatives that might serve similar purposes, too.
http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/passive-forms
