can’t / couldn’t have
can’t / couldn’t have
can't和couldn't
couldn't have done?
能否解释一下musn't,needn't ,don't have to,can't ,couldn't的区别?
couldn't have finished和 can't have finished 的区别
can’t have been与couldn’t have been的区别?
I couldn’t have hoped for a better outcome什么意思,另外can't have
情态动词can't have done 和couldn't have done 有什么区别吗
can't与couldn't的区别
couldn't与can't的区别!
can't与couldn't区别,
can't与couldn't 的用法