You ought to have helped him with his Englis,(

问题描述:

You ought to have helped him with his Englis,(
2.We ought to help each other in our work,(
为什么前面用shouldn't you后面用oughtn't we?
有什么区别么
选项里是shouldn't 和 oughtn't都有啊,肯定有区别

第一个是本应该,是对过去的看法,反义疑问句用过去时,是说当时是吗
第二个两个都可以