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.
(..) Dialogue: Marked=..,Default,NTP,!Effect,...for sheer dumb luck. Dialogue: Marked=..,Default,NTP,!Effect,Perhaps you ought to go.\Nlt might wake up. Dialogue: Marked=..,Default,NTP,!Effect,-Good of you to get us out of trouble like that.\N-Mind you, we did save her life. (..)2001 Harry Potter and the Sorcerer's Stone
(..) Dialogue: Marked=..,Default,NTP,!Effect,Troll! In the dungeon! Dialogue: Marked=..,Default,NTP,!Effect,Troll in the dungeon! Dialogue: Marked=..,Default,NTP,!Effect,Thought you ought to know. Dialogue: Marked=..,Default,NTP,!Effect,Silence! Dialogue: Marked=..,Default,NTP,!Effect,Now... (..)2001 Harry Potter and the Sorcerer's Stone