We must be on time for cless的意思

We must be on time for cless的意思 我们必须准时为什么省略BE?We must on time? we must ______(eat) in the dining hall. Must we ______(be) on time next time.求助 急. OK,so we must be on time .Can we bring music players to school? You must be there on time. you must _____(be) on time next time. You must be on time.为什么要用be? We must finish our work on time 被动语态 We must finish our homework on time 改一般疑问句 We must finish the work on time 变被动语态 We must finish our work on time 被动语态 get,must,time,school,on,to,we连词成句 We must go to school on time变成一般疑问句 we must return these m___to the library on time We must go to school on time变成否定句? We must _______(is) on time for the meeting. We must go there on time.的否定句 Mr Li!Can we arrive at school late?Sorry ,you _______ on time.横线上为什么填must be 而不填must?