变成一般疑问句方法
had better，should，ought to 构成一般疑问句时应分别将 had，should，ought 提到句首，其肯定与否定回答为 had / hadnt，should / shouldnt，ought / oughtnt .
例：
一般疑问句Ought he to start now?Yes ，he ought.他现在该动身了吗?该动身了.
-Ought we to pay the bill right now?
-No， you ought not to．
ought的一般疑问句的否定回答是，No，she ought not to．
ought to 应该的意思，比方说ought you to finish the work now?你现在应该做完工作吗
肯定回答yes，I ought否定回答No，I oughtn't。
