can't be ,mustn't belook,miss Lin is in the classroom,the lady who is standing outside the classroom __ her.a.can't be b.mustn't be原因

can‘t be 和mustn’t be的用法 mayn't be ,can't be,mustn't be,shouldn't be的区别 存在can be/must be ,can’t be 而没有mustn't be 为什么must be的否定式是can't be而不是mustn't be 有can't be那么有没有mustn't be 和may not be i didn't break the window.It __ the truth.He is lying.can't be mustn't be shouldn't isn't 选哪个A.can't be B.mustn't be C.shouldn't be D.isn't can't be 和 must’t be有什么区别?比如，he can't be here.he mustn;t be here 有什么区别？ The story ________ be true.A.can B.can't C.may not D.mustn't Today is Wednesday.He _______be at home.He ______ be at school.A.can’t,can B.can’t,must C.mustn’t,must D.mustn’t,can can,can't,must,mustn't,needn't,be allowed to,have to,don't have to的区别 NO it ____his.His much smaller.A.can't be B.may be C.mustn't be 选哪个?为什么? You mustn't be silly中文是什么意思 Please be quiet!The other ( ) hear very!A.can't B.mustn't C.shouldn’t D.needn't To make our city more beautiful,rubbish mustn't be thrown into the river.为什么用的是mustn't be thrown,而不能用can't throw? 单项选择 Something（） wrong with the clock.It doesn't workA.must be B can’t be C could be D mustn‘t be she looks very young.she ( )more than forty.A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案） It must be yours.改为否定句怎么改啊?是用mustn't be还是用can't mustn't和can'tSusan ____ be here now because she has just gone to NewYork.应该填mustn't还是can't?详细的分析..