viết câu sang câu bị động 1. The students has discussed the pollution problems since last week 2. How many languages do they speak in canada ? 3. My brother has been playing soccer for 3 hours 4. We will do our homework tomorrow 5. Mary was reading the novel at this time last night 6. Are you going to repair those shoes ? 7. You should turn off the lights before going out 8. Have you finished the above sentences 9. Do you buy the flowwers ? 10. Was she reading the book at this time last night ? 11. Tom going to visit his grand parents next week 12. Tom will visit his grandparents next week