there's no use
Examples
There's no use saying anything in the schoolyard because there's always someone with an answer and there's nothing you can do but punch them in the nose and if you were to punch everyone who has an answer you'd be punching morning noon and night.
Once you decide to gut a fish, there's no use waiting till it rots.
There's no use in denying it: this has been a bad week. I've started drinking my own urine.
There's no use asking the cow to pour you a glass of milk.
There's no use in closing the barn door after the horse is stolen.
There's no use to pray after the devil has you.