记住第一点：ought to后面一定是原型,和虚拟语气无关.
第二点：你要的虚拟语气其实已经含在了have been done这个意思里,也即ought to have done sth的意思是你应该做某事（而你却没做）,含有否定的意思,所以是虚拟的.
ought to的用法?This experiment ought to _____ last week.中间应使用ha
3个回答
相关问题
-
ought to的用法及否定形式
-
It’s nothing unusual to experience failure, and _____ ought
-
___leaves the room last ought to turn off the
-
是she ought never to还是she ought to never?
-
ought to have done和ought to do有什么区别
-
should 与 ought to 与had better区别及用法?
-
Ought,ought't to,should,shouldn't Mustn't,
-
should 和 ought to 的不同点、相同点、和用法.
-
She ought to stop _______. She has a headache because she __
-
EG:ought to not 还是ought not to 这种问题是否有规律