- http://www.kico4u.de/english/uebungen/passiv/simplepresein.htm
- https://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present
- http://www.esl-lounge.com/student/grammar/3g22-passive-present-exercise.php
- https://www.ego4u.com/en/cram-up/grammar/passive/exercises
- http://first-english.org/english_learning/english_active_passive/02_english_active_passive_exercises.htm
- //www.ego4u.com/en/cram-up/grammar/passive/exercises?02
- http://www.ang.pl/cwiczenia/928
- http://first-english.org/english_learning/english_active_passive/31_active_passive_simple_past_exercises.htm
- http://eslus.com/LESSONS/GRAMMAR/PASSIVE/Gramc.htm
PAST OR PRESENT?
- http://www.english-grammar-lessons.com/passive/exercise4.swf
- http://www.ecenglish.com/learnenglish/lessons/making-passive-sentences
- http://www.ecenglish.com/learnenglish/lessons/passive-tense-review/
- http://www.esl-lounge.com/student/grammar/3g20-passive-active-exercise.php
- http://oud.digischool.nl/en/grammar/hotpot/passive/tegenverltijd.htm
- http://www.englishexercises.org/makeagame/viewgame.asp?id=1870
- http://www.englishexercises.org/makeagame/viewgame.asp?id=7324
