> I'm sure that's true. I accidentally an important word there. It should be "I'm not sure that's true." It's an English expression that's a bit understated: i

> I'm sure that's true. I accidentally an important word there. It should be "I'm not sure that's true." It's an English expression that's a bit understated: it means "I'm confident that this is wrong". You can't always argue from "what feels natural" - that's prone to mere familiarity (1), and someone else who is more used to the other way will have the opposite "feel". It's subjective, and not universal. 1) https://en.wikipedia.org/wiki/Mere-exposure_effect https://en.wikipedia.org/wiki/Mere-exposure_effect