3. Decide which of the sentences can be changed to passive voice. Write them down. Explain why two of them cannot. 1. Mr Smith will collect the tickets. _____________________ 2. The students put on a play at the end of term. _____________________ 3. Jim is always late for work. _____________________ 4. Julie took the message. _____________________ 5. A local artist painted the picture. _____________________ 6. They arrived at the theatre at 8.30 p.m. _____________________ (có thể giải thích kĩ tại sao 2 câu đó tại sao sai. em cảm ơn)