can't be ,mustn't be
can't be ,mustn't be
can‘t be 和mustn’t be的用法
存在can be/must be ,can’t be 而没有mustn't be
有can't be那么有没有mustn't be 和may not be
为什么must be的否定式是can't be而不是mustn't be
can,can't,must,mustn't,needn't,be allowed to,have to,don't h
Tom _______(can’t/mustn't) be at home .he said he would go t
you mustn't be late for school.you can't ( )in class.you can
Please be quiet!The other ( ) hear very!A.can't B.mustn't C.
You mustn't believe the news,it can't be true.
Our teacher must be in his office,A mustn't he B can't he C
It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't