英文Passive voice:What did he write it with?Students are doing

英文Passive voice:What did he write it with?Students are doing what are they doing with it? what did he do with it what did he do with it? Rewrite the sentence with the passive voice passive voice. what did he do with it,和what did he do 有什么区别呢? what are the students doing now? The teacher did what he could （ ）his students with their Eng Now it's five pm.What are the students doing at these places now it is 5:00 pm.what are the students doing at these place 解释英文的passive voice,并介绍它的用法?