change the sentences into the passive voice
1 we should clean these winows before tomorrow
2 the workers gave the boss some flowers
3 the police followed the thieves into a building
4 the mehanic cant fix me car
5 the neighbour has told us the news
6 the students painted the walls last years
7 the old woman feeds the pigeons every day
8 they willl pick up John at this office
9 she showed the visitors the new house
10 you shouldnt throw litter on the ground