For 8th form

Passive Voice
При написании предложений в Passive Voice  используйте  следующие преобразования в соответствующем времени:

1. Present Simple:   make/ makes      ------   am/is/are made
2. Present Contin:   am /is/are making ------ am/is/are being made
3. Past Simple :       made                  ------  was made
4. Past Continuous: was/ were making -----  was/ were being made
5. Present Perfect:  have/ has made     ------ have/ has been made
6. Past Perfect :      had made             ------ had been made
7. Future:                will make             ------ will be made
8. Modals:              can make             ------ could be made

Не забывайте, что в Passive Voice подлежащее и дополнение меняются местами. При постановке вопроса (общем -ко всему предложению) на первое место идет первая часть составного сказуемого, затем подлежащее, а потом оставшаяся часть сказуемого. 
    Ex:  Cars are made in this factory .
           Are cars made in this factory?
При вопросе к подлежащему :
     Ex. The letters were posted by a postman.
            Who were the letters posted by?