Passive Voice B1

http://www.english-grammar.at/online_exercises/passive-voice/pa007-active-passive.htm

http://www.english-grammar.at/online_exercises/passive-voice/pa006-active-passive.htm

http://www.english-grammar.at/online_exercises/passive-voice/pa001-passive-voice-sentences.htm

http://www.english-grammar.at/online_exercises/passive-voice/pa011-active-passive.htm

http://digitalcampus.free.fr/Level3/Unit32/SubUnit321/PassiveConversion01.jcl.htm

http://www.english-grammar.at/online_exercises/passive-voice/pa010-active-passive.htm

https://www.ecenglish.com/learnenglish/lessons/making-passive-sentences