PASSIVE VOICE- PRESENT AND PAST SIMPLE

Here you have some exersices to practise the passive voice in present and past simple.
Let's revise first the structure:
 Sub    + to be (is/are/was/were) + participio + C.Ag (by ....)
 The thief                      was                                        arrested              by the police
 Buildings                     aren't                                      made                  of paper


http://www.clafoti.com/3/pass2.htm

http://www.clafoti.com/3/passive5.htm

http://www.clafoti.com/1.4/24/24.1.htm


http://www.clafoti.com/1.4/25/25.1.htm