Change into passive voice. 1. They knew that he stole the car. ……………………………………………………………………………………….. 2. It is difficult to answer the questions ……………………………………………………………………………………….. 3. She will be able to meet him. ………………………………………………………………………………………. 4. He is going to visit the family. ………………………………………………………………………………… 5. You must sweep the room everyday. …………………………………………………………………………………….. 6. We have to learn English every night. …………………………………………………………………………………… 7. They must improve plumbing at the village. ……………………………………………………………………………………………………. 8. He is going to grow vegetables in the garden. …………………………………………………………………………………………… 9. She used to drink coffee at night. ………………………………………………………………………………………….. 10. The people can raise cows at Duc Linh. …………………………………………………………………………………………… 11. Have you ever met her? …………………………………………………………………………………………. 12. Who can do the exercises? ………………………………………………………………………………… 13. What are you doing?