can、would、ought、might在用法上有什么区别?ought的否定句式怎么做?
can、could、may 、might、must、ought 的区别和用法
should 和ought to在用法上有什么异同?
ought to的用法及否定形式
情态动词的用法:must,can(could),may(might),ought to need,dare shall(
ought to的用法?
ought to的用法
ought to 和ought 的区别
ought to 和should有什么区别?
ought to 和 may 有什么区别
ought to和should有什么区别?
should 和 ought to 有什么区别?
should may might would could can ought to must 语气强弱程度