Chuyển sang câu bị động
19. By next year the students will have completed their study. → ________________________________________________________________________
20. James might cook the dinner. → ________________________________________________________________________
21. Some students study grammar on the Internet. → ________________________________________________________________________
22. No one painted the building last year. → ________________________________________________________________________
23. Alexander Fleming discovered penicillin in 1928. → ________________________________________________________________________
24. John’s mother had raised him in a small town. → ________________________________________________________________________
25. The police are protecting the town. → ________________________________________________________________________
26. I cannot fix the problems. → ________________________________________________________________________
27. Many people bought the tickets for last night’s concert in Paris. → ________________________________________________________________________
28. Scientists have discovered new species of frog. → ________________________________________________________________________