Explanation:
1. http://www.grammarbank.com/simple-present-passive.html
2. http://www.fetsystem.com/englishgrammar/passive-voice-present-simple-tense
3. http://www.englishpractice.com/improve/active-passive-voice-tensewise-rules/
Exercises:
1. http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present
2. http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_present.htm
3. https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit10/grammar/exercise1?cc=us&selLanguage=en
4. http://www.perfect-english-grammar.com/passive-exercise-1.html
Video:
1. http://www.youtube.com/watch?v=3mDrItKId4g
1. http://www.grammarbank.com/simple-present-passive.html
2. http://www.fetsystem.com/englishgrammar/passive-voice-present-simple-tense
3. http://www.englishpractice.com/improve/active-passive-voice-tensewise-rules/
Exercises:
1. http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present
2. http://www.englisch-hilfen.de/en/exercises/active_passive/sentences_simple_present.htm
3. https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit10/grammar/exercise1?cc=us&selLanguage=en
4. http://www.perfect-english-grammar.com/passive-exercise-1.html
Video:
1. http://www.youtube.com/watch?v=3mDrItKId4g