为什么must的否定式要用can’t或者needn’t?may要用can’t
为什么must的否定式要用can’t或者needn’t?may要用can’t
为什么must be的否定式是can't be而不是mustn't be
must,need,can,may的否定式?
用should,shouldn’t,must,mustn’t,needn’t,can’t ,may,have to 填空
用适当的情态动词can,may,must,mustn’t,needn’t填空
may can must need的区别及may not ,can't,mustn't,needn't的区别?
将下列句子改成否定句和疑问句,用can,may,must,can't,mustn't,needn't填空
Complete the conversations with can,can't,may,must,needn't
must的否定式是musn't还是mustn't
选词填空 can can't must needn't
用can,may,must,can't,mustn't填空.
用can,may,must,can't,mustn't 填空