用Must be/do或Can't be/do改句子.

用must,can't改句子 can't be 和 must’t be can‘t be must’t be区别 there must be something you can do 中文意思是什么 It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't 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 nothing you can do that can't be done 用must或can't填空 1、that woman ( ) be at least 50.she looks old although i do not know you can be better that i must get be must be do与must be doing 区别 是must be to do还是must be doing