It 'ought not' ('to') make any difference. [=(more commonly) it shouldn't make any difference]
Children 'ought not' [='should not'] run near the pool.
If my math is correct, the result 'ought to' be zero.
(..) king of all Norway before she would marry me. That is my Princess. I think of her every day of my life. That's her. Well, then you ought to go say hello. Hv'tserkr! Brother. People from Norway, Sweden, even Denmark. All to avenge Ragnar. (..)2017 TvShow: Vikings Title: Revenge Season: 4 Episode 18