Originally Posted by
henkybaby
I never knew that in this context 'I'm sure' actually conveys that you are stating a fact. I always thought it meant 'with a great degree of confidence' or 'it seems very likely that'. English is a literal language. I must remember that when someone says 'Yes. Very good. Ah welll...".

Ok how about this then
How can you have a great degree of confidence in either of those two things?