Passive voice

Perfect English: the Passive Voice

Advanced English Grammar Lesson for ESL - Passive Voice

Passive Voice (Part 1)

Passive Voice (Part 2)

Useful links to practice

http://www.englisch-hilfen.de/en/exercises/active_passive/passive_sentences1.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_past.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_present.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/objects_tenses.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_gaps.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive.htm

http://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive1.htm