"goes without saying" and its negation

[cubisto]

Are my sentences correct?
It goes without saying that I'd do that for you.
And now the negation of the sentence.
It doesn't go without saying that I'd do that for you.
It goes not without saying that I'd do that for you.

 

[tedmc]

Why would you want to use the double negative there?

 

[teechar]

It doesn't go without saying that I'd do that for you.

This one might work in some contexts.

It goes not without saying that I'd do that for you.

This one is odd.

 

[Rover_KE]

The nearest antonym to 'it goes without saying that ...' is 'it has to be said that ...'

 

[GoesStation]

Cubisto, the message here is that you really can't negate it goes without saying. You have to phrase its opposite differently.

 

[cubisto]

Cubisto, the message here is that you really can't negate it goes without saying. You have to phrase its opposite differently.

Thanks. I kind of thought that when I started this thread. But as a foreign speaker you never know that for sure until you tried it.

So, what about this phrase?
It isn't self-evident that I'd do that for you.

 

[GoesStation]

So, what about this phrase?
It isn't self-evident that I'd do that for you.

It's hard to think of a context where anyone would say that, but it's not unnatural.