a) Passengers shouldn’t throw away their tickets.
The tickets shouldn't be thrown by passengers.
b) Candidates may not use
c) A machine could do this mụch more easily
This could be done much more easily by a machine.
d) His family will see him off at the airport.
He will be seen off at the airport by his family
f) Mrs Green had taken Alice to the dentist before you saw her
Miss Snow was typing ten letters before lunchtime yesterday.