Don't know about questions, but there are couple of answers I have learned to be serious red flags: 1. Yes, I understand. (with no further elaboration or clarifying questions) 2. It's okay/good/going well (again, with no further elaboration when asking how something is going/set up etc) First one typically translates to something between "I have a completely unfounded illusion of understanding" and "I have no clue bu…
Or "I'm tired of this droning conference call/meeting where I can barely understand some people's accents and I'd rather just clarify some points in writing later where I don't have to rely on my memory."
>"I have no clue whatsoever"
Or it really is going fine and I don't want to spend forever going into technical details the person asking isn't even going to understand and get interrogated on anything that doesn't sound like it's going perfectly, when everything is under control on my end.