Change from Active into Passive. 9 All the ministers will see him off at the airport.
10 He hasn't written his exercises.
11 We can build on more rooms.
12 They haven't stamped the letter.
13 They are repairing my piano at the moment.
14 Passengers shouldn't throw away their tickets
15 The milkman brings the milk to my door but the postman leaves the letters in the hall.
16 Someone left this purse in a classroom yesterday;