Passive Voice in English
Introduction : what is the structure in the passive voice?
Subject+ verb to be + past participle
Subject+ verb to be in the negative form+ past participle
N.B. You need to recognize the tense in the ACTIVE FORM to change it into the PASSIVE FORM ( check the explanations)
First of all you should know about the Passive Voice in Italian if you are not sure about it in English.
Here is a link to revise the use of it in Italian with some clear explanations http://aulalingue.scuola.zanichelli.it/benvenuti/2013/01/17/la-forma-passiva-1/
Here are some presentations about the main tenses and the passive Voice in English: you'll need to study them and know the main tenses.
Tenses in Passive Voice from PiretL
Link to a presentation online with exercises:
https://docs.google.com/presentation/d/1S8fKJbkst5ScDAXapTy8Yx76nkyBNsmAw23II87Wrjs/edit?usp=sharing
A presentation online on the British Council website:
http://learnenglish.britishcouncil.org/en/english-grammar/verbs/active-and-passive-voice
Exercises online
http://www.englisch-hilfen.de/en/exercises_list/passiv.htm
http://www.write.armstrong.edu/handouts/PassiveVoiceExercises.pdf
http://www.esl-classroom.com/grammar/passive2.html
http://faculty.mu.edu.sa/public/uploads/1424707542.8346ACTIVE-AND-PASSIVE-VOICE.pdf