Rewrite these sentences in the passive voice. 1)we had warned him the day before not to go too near the canal 2)you should keep the flowers in a warm sunny place the 3)you should pay your bill before you leave the hotel you 4) we expect students not to talk during the examination
1. He was warned the day before about the danger near the canal.
2. The flowers must be kept in a warm sunny place.
3. Your bill must be paid before your leaving the hotel.
4. Students are forbidden to talk during the examination.