“By the way, this case cannot win. I’m pretty sure...”
I can’t believe you put these two thoughts back to back. Either you know or you don’t know. If you don’t know — as you indicate here — then how do you know the case cannot be won?
“I can’t believe you put these two thoughts back to back. Either you know or you don’t know. If you don’t know — as you indicate here — then how do you know the case cannot be won?”
Oh, for pete’s sake, that’s just a manner of speaking. You could say that the phrase “I’m pretty sure” is a rhetorical device. Certainty usually makes for more powerful writing, but no one wants to look like they’re dictating from on high about matters high and low.