第一道的题目是：用Must be/do 或Can't be/do改写句子 第二道上面有

是must be to do还是must be doing 为什么must be的否定式是can't be而不是mustn't be must be\can`t be\may be的区别 为什么She must be a teacher 的反义疑问句用isn't she ,They must do thei can't be 和 must’t be can‘t be must’t be区别 句子的意思A foreign language can't be taugh,it must be learnt 用must have been/done或can*t have been/done 改写句子 there must be something you can do 中文意思是什么 can't be 与 must be的区别 It must be taken actions to do sth.和 Actions must be taken t 用sb must be和can't be doing造句