Chuyển sang câu bị động. 13. She is writing a letter now. ....................................................................................... 14. The master punished the servant yesterday at the room. .......................................................................................................... 15. He was writing a book at the moment. ............................................................................................................ 16. Who wrote this letter? .............................................................................................................. 17. Somebody cooks meal every day. ....................................................................................................... 18. He wore a blue shirt last week. ............................................................................................................. 19. They are building a house at present. ................................................................................................................. 20. I have finished the job already. .......................................................................................................... 21. I sent the report yesterday. ................................................................................................................. 22. She bought a diamond necklace last year. ............................................................................................................... 23. Somebody had stolen my purse . .........................................................................................