I was envisioning some sort of context-system, in part for the reason you describe and in part because people probably have specific learning needs, and at any given time they'd probably be focusing on a specific context.

Also I reiterate what I've said to other commenters: likening it to Anki flashcards was probably misguided on my part. I'm not talking about generating a bunch of static flashcards, but about presenting a user with a dynamically-generated statement for them to parse. The interface would be reminiscent of something like Anki, but it would probably never show you the same statement twice.