1. the picture was painted by my sister 2. he was laughed at by his friend 3. the soil was prepared by the gardener 4. his words must be listened to by us 5. the tanks can store the water 6. the weak shouldn't be insulted 7. the bill should be payed today 8. you're being watched by me very carefully 9. letters are being written by john 10. the river has a new bridge built across it 11. the results have been announced by them 12. why was it done by you?
