26.They must be doctors,___________ they?A.mustn’t B.needn’t C.aren’t D.are27.He is so careful that he always looks over his exercise to _______ there are no mistakes.A.make sure B.find out C.think about D.try on28.Joe can’t be in the office

They must be Chinese They must be careful的一般疑问句 They must be playing反意疑问句 they must be out of their minds 翻译 must,they,from,outer,be,creatures,space 连词成句 they,movie,be,must,making,a 连词成句 excited,a,must,in,house,they,be,to,new.组词成句、、、 They must _____(be)at school by eight o'clock children must be ____(dependence)when they grow up. They must be in the reading-room,_______ _______[They must be in the reading-room,_______ _______[反义疑问句] They must be waiting for us,()?a.aren't they b.mustn't they 求辨析 They must be there now,aren't they?这里为什么不是mustn't they而是aren't they? must be what must be must be! what they listen to and read cannot be a formula .it must be will be/must be类似助动词或情态动词加be,例如：they will be there,这是主系表的结构吗? they must feel really worried,don' t they?为什么不是 mustn’t they?老师有说过must be 是 用be动词反意疑问must do 用 动词的反意疑问 People must be encouraged in their efforts and they should pride themselves on saving