ought to 用法是什么?

ought to 用法是什么? 讲讲ought to的用法 ought to的意思及用法 should 和ought to在用法上有什么异同?主要是不同之处是什么? had better,should,ought to的用法.should,和ought to 的用法是相近的吧?ought to呢, ought to 和be supposed to 的区别和用法 must,ought to 二词的区别与用法 had better/should/ought to的具体用法 should 和 ought to 的不同点、相同点、和用法. ought to 否定形式是什么谢谢 ought to的否定形式是什么? ought to sort of在这句里的用法It sort of implies that a nurse ought to be female.sort of可以修饰动词imply么?这是什么用法呢 ought to的用法ought to和should有些像,那么should I do so?should改成ought to该怎么变. ought to 的否定形式是什么 怎么改疑问句 ought的词性是什么? 英语高手帮忙分析一句话A great deal of time was wasted playing but ought to have been fully used.句子成份?这里but是什么用法? ought to 和ought 的区别 ought 其中,to是不定式符号吗?用词词组造句.疑问句怎么变?否定式是什么?若回答疑问句，是yes,she ought还是yes,she ought to.