Si lo sabré yo

[Glen]

They say this means Yeah, tell me about it when someone says something you already knew beforehand. Right? Is it a set phrase? The thing is, I can't get that meaning from the grammatical construction. I was thinking more along the lines of Yo lo sabía for example.

[JPablo]

Do you doubt that "I myself may know [this]"?

"[What are you going to] tell me about it [that I don't already know]".

The "grammar" structure is "hidden semantically", but the concept is like you say "Yeah, tell me about it" (as if I knew nothing about it... when I know all of of it and more...)

"Como si no lo supiera yo" could be an equivalent in Spanish, but "Si lo sabré yo"... even if using a future tense, is conveying the idea that "I've already gone that route, brother..."

Do I make some kind of sense with my explanation? (I hope so!)

[Glen]

Yes, perfect sense. Thanks!

[JPablo]

You're welcome!

[AngelicaDeAlquezar]

I agree with Pablo.

I think this is pretty much something like "Boy, do I know about it".

[chileno]

Been there, done that.

[Glen]

@Chileno, what I had in mind was, the reply you give to someone sitting indoors who says It's raining out there when you have just come in the door soaking wet from the rain. Yeah, tell me about it.
I wonder if you could say the same thing using Ni que me digas or should that one go in a different thread itself?

[AngelicaDeAlquezar]

It could be used. It just depends on the situation. You're just expressing that you have experienced something and you know what it is like.

[chileno]

Originally Posted by Glen

@Chileno, what I had in mind was, the reply you give to someone sitting indoors who says It's raining out there when you have just come in the door soaking wet from the rain. Yeah, tell me about it.
I wonder if you could say the same thing using Ni que me digas or should that one go in a different thread itself?

You don't have to say that again.