"安心しないで" Hello! I have trouble understanding why the "suru" negative form "しない" is sometimes use to get to a "not negative" result. I understand that this sentence means "do not worry", but it seems that, in various cases, you would use the negative form instead of the normal one, and i could do the mistake to translate it into "don't be relieved" which has the opposite meaning. its feels even weirder when you can also say "安心してください " for example. Which (kind of) translate the same as "安心しないでください". (rest assured/don't worry). Am i missing something? Is there any rules to explain how its working? thank you for your help!