Change into passive :
1 . You can't wash this coat .
=> This coat
2 He may keep books for 3 weeks .
=> Books
3 Visitors shouldn't throw away their tickets .
=> Visitors
4 We shall have to tow the car to the garage .
=> The car
5 Visitors must leave umbrellas here.
=> Umbrellas
6 You should have taken those books back to the boss.
=> Those books
7 We cannot exchange articles which customers have bought during the sale .
=> Articles
8 You mustn's move this man ; he's too ill.
=> This man