ChuyÓn tõ c©u chñ ®éng sang c©u bÞ ®éng (4) 1. They performed Christmas songs 800 years ago. 2. Somebody will call Mr. Green tonight. 3. These workers are building a new hospital. 4. Nobody has used this room for ages. 5. Hoa sent a Christmas card to Lan last Christmas. 6. Santa Claus gives children presents on Christmas Eve. 7. Mary’s parents sent her some money. 8. Each competitor must take a bottle on the river bank. 9. Did they build this monument ten years ago? 10. They delayed the football match. 11. People put many kinds of newspapers on the table. 12. Tom must write this essay. 13. My father has just bought a lot of new books. 14. People will publish this novel in February. 15.They are building a new hotel. 16. Betty has just sent Mai many postcards. 17. Hoa sent her mother a gift. 18. They will build many new schools in the future. 19. Students must write the answer in ink. 20. He wrote all the songs on this new album. 21. They held rice-cooking festival in Thon Trieu last year. 22. We must solve this problem soon. 23. Nguyen Du wrote Truyen Kieu. 24. We must do something for these poor men. 25. They have to separate the rice from the husk. 26. He shouldn’t do that silly thing. 27. The boy operates that tape-recorder. 28. They gave us a post card. 29. The student cleaned the room every day. 30. I had lost some of my books. 31. We believe these boys to become better. 32. The scientists found the problem. 33. The cat pulls the pan into the sink. 34. He gives her a novel about a love story. 35. They were painting a house. . ChuyÓn tõ c©u chñ ®éng sang c©u bÞ ®éng (4) 1. They performed Christmas songs 80 0 years ago. 2. Somebody will call Mr. Green tonight. 3 children presents on Christmas Eve. 7. Mary’s parents sent her some money. 8. Each competitor must take a bottle on the river bank. 9. Did they build this