Correctness does not settle appropriateness
A learner can build a grammatical request that sounds more ceremonial than the relationship requires, or a concise disagreement that feels sharper than intended. These are not well described by a red underline. The form may be legal; the problem lies in how the choice positions the speaker relative to the listener.
For B2–C1 learners, this is often where additional vocabulary produces diminishing returns. Several ways to perform the same Move, labelled by register and stance, can be more useful than another list of synonyms.
Compare Frames that solve the same job at different levels
Take one job such as requesting a change, disagreeing or expressing uncertainty. Collect a direct, neutral and more formal Frame where the language genuinely supports those distinctions. Compare realistic contexts instead of attaching vague labels such as “advanced” or “professional.”
The important question is what changes in social meaning. Who could say this to whom? Would it fit a chat, a meeting, a report or a complaint? These contextual boundaries make register trainable rather than mystical.
Cross-language Bridges should carry register notes
If an English and Russian or German Frame share a Move, their Bridge should not imply identical interpersonal force. One side may be the ordinary neutral choice while the closest-looking expression on the other side is marked as formal or unusually direct.
Practice can then start from a situation and require both a functional and register decision. That is closer to real communication than translating a polite source sentence and assuming its social temperature survives unchanged.