Re: Yes?
Apologies for the slightly clumsy formulation of my logic there. The confusion arises because one is a simple statement and the other offers a reason why :
My example : Yes. I could not forsee it (I agree THAT I could not)
You : No, I couldn't forsee it (I disagree BECAUSE I could not)
Something like that anyway, it could have been better put, that's for sure!