And when I don't ask questions, but assume the other parties already knows what I know, I get problems. So... I have to find a way to ascertain that other part

And when I don't ask questions, but assume the other parties already knows what I know, I get problems. So... I have to find a way to ascertain that other parties know what I know (more or less) - without sounding like I'm asking a question to show what I know.