Look for choices that change the speaker’s stance
Advanced language contains many small decisions about certainty, distance, politeness and framing. A useful annotation can direct attention to the words that soften a claim, restrict its scope or signal that the speaker is revising an earlier interpretation.
The question becomes “what is this person doing with the sentence?” rather than only “what tense is this?” Grammar still matters, but it serves a communicative decision.
Mark constructions that are easy to understand but hard to produce
Many B2–C1 expressions are transparent when you read them. That makes them easy to skip. Yet when you need the same Move yourself, the construction does not appear. These are good candidates for selective Marks and Frames because the bottleneck is not comprehension; it is availability.
Formulaic-language research is relevant to this gap between knowing words and having multiword sequences ready for use. Metkagram uses that research as context, while keeping direct product efficacy claims separate.
Compare neighbouring Frames, not just isolated examples
Once a Frame is visible, place it next to another way of doing a similar job. A cautious conclusion, a strong conclusion and a partial concession may share vocabulary while differing in stance. Annotated examples can make the decisive span easier to locate before the learner performs a Choice task.
This creates a richer unit of study: not “learn this phrase,” but “notice why this phrase fits here rather than its neighbour.”
Make advanced annotation disappear quickly
An advanced learner usually needs less persistent support. Use the Mark to expose a subtle relation, then move rapidly to unannotated examples, contrast, retrieval and personal production. The goal is not to make adult reading permanently look like a teaching edition.
If you already notice the target reliably in plain text, skip the annotation. The method should remove friction, not insist on a ritual after the problem has disappeared.