Present and Past Passive Voice

Form of Passive

Subject (object) + finite form of to be + Past Participle (3rd column of irregular verbs)

Examples of Passive 

Tense		Subject	Verb	Object
Simple Present	Active:	Rita	writes	a letter.
	Passive:	A letter	is written	by Rita.
Simple Past	Active:	Rita	wrote	a letter.
	Passive:	A letter	was written	by Rita.

EXERCISES ONLINE

https://www.ego4u.com/en/cram-up/grammar/passive/exercises

https://www.ego4u.com/en/cram-up/grammar/passive/exercises?02

https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present

https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past

https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present-2

https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past-2

http://www.englisch-hilfen.de/en/complex_tests/passive1/index.php

http://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive.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://first-english.org/english_learning/english_active_passive/02_english_active_passive_exercises.htm

http://www.english-4u.de/passive_ex2.htm

http://first-english.org/english_learning/english_active_passive/06_active_passive_english_exercises.htm

http://first-english.org/english_learning/english_active_passive/10_active_passive_word_order.htm

http://first-english.org/english_learning/english_active_passive/08_active_passive_simple_present_english.htm

http://first-english.org/english_learning/english_active_passive/11_active_passive_word_order_exercises.htm

http://first-english.org/english_learning/english_active_passive/30_active_passive_simple_past.htm

http://first-english.org/english_learning/english_active_passive/31_active_passive_simple_past_exercises.htm

http://first-english.org/english_learning/english_active_passive/33.htm

http://first-english.org/english_learning/english_active_passive/34_active_passive_simple_past_english.htm

http://first-english.org/english_learning/english_active_passive/37_activ_passive_simple_past_word_order.htm

http://www.perfect-english-grammar.com/passive-exercise-1.html

http://www.perfect-english-grammar.com/passive-exercise-2.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=1870

https://elt.oup.com/student/solutions/preint/grammar/grammar_10_012e?cc=global&selLanguage=en

http://www.agendaweb.org/verbs/passive-exercises.html

http://www.agendaweb.org/verbs/passive-voice-exercises.html

GAMES

http://www.eslgamesplus.com/passive-voice-past-passive-esl-grammar-sentence-activity-fun-game-online/

http://www.eslgamesworld.com/members/games/grammar/football/passive%20voice/passive%20voice.html

http://www.eslgamesworld.com/members/games/grammar/basketball/active%20vs.%20passive%20voice/active%20vs.%20passive%20voice.html