I also had a hard time moving it forward. Mostly asking about single words picked from the text worked best, but as a result it feels a bit like choose your own adventure but with hidden choices. And I'd try to ask about things that seemed important and get "You can't form your question into words" only to try with different words later and finally get some information. (But I always have this problem with IF... maybe I'm not patient enough, or have to learn the typical IF vocabulary, or maybe I just word things in funny ways, I don't know.)