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Exploiting the English Grammar Profile for L2 grammatical analysis with LLMs

Paper · 2026 · Stefano Banno, Penny Karanasou, Kate Knill et al.

Summary

The paper tackles automatic analysis of L2 English grammar that goes beyond error spotting. It also records which constructions learners attempt and whether they get them right. The authors build on the English Grammar Profile (EGP), a catalogue of over 1,000 constructs. Each construct is written as a can-do statement, tied to a CEFR level, and illustrated with learner examples. The framework compares each learner sentence with a corrected version. A construct found in the corrected text counts as attempted, and its form in the original shows success or failure. For 12 selected EGP statements, the authors annotate a subset of learner essays. They then compare two LLMs (Qwen 2.5 32B, GPT-4.1) with two rule-based systems (their own RB and the public POLKE). LLMs are stronger on constructs that depend on meaning or pragmatics, while rules stay competitive on purely morphosyntactic ones. Detected attempts, especially successful ones, predict holistic CEFR proficiency, and a rule pre-filter followed by a zero-shot LLM gives the best scoring. Replacing manual corrections with GECToR output costs little, mainly for successful attempts. The approach enables positive, actionable feedback.

Key points

  • The resource is the English Grammar Profile. It was chosen over the GSE and the CEFR-J Grammar Profile because it is downloadable, covers many L1 backgrounds, and includes learner examples.
  • The new annotated dataset targets 12 EGP can-do statements on essays drawn from a publicly available L2 learner corpus.
  • Four systems are compared: RB, POLKE, Qwen 2.5 32B and GPT-4.1. Each is scored on general, successful and unsuccessful attempts using precision, recall and F1.
  • There are two pipelines. A semi-automated one uses manual corrections, and a fully automated one uses GECToR corrections.
  • Unsuccessful attempts are much harder for every system than general or successful ones. With GECToR corrections, the averaged F1 for unsuccessful attempts stays below 50.

Interesting ideas

  • I1. Analyse a sentence together with its corrected version: a construct present in both is a success, while one present only after correction is a failed attempt, so the system captures intent as well as errors.
  • I2. Use cheap high-recall rules as a pre-filter and let an LLM confirm only the flagged candidates, which keeps costs low and reduces false positives.
  • I3. Assign each construct to rules or to a model according to whether it needs semantic or pragmatic interpretation, rather than using one method for everything.
  • I4. Use interpretable, level-tagged can-do statements as features for proficiency scoring, so every score can be traced to concrete constructions the writer produced.
  • I5. Measure error propagation by running the same evaluation with gold upstream input (manual corrections) and with predicted upstream input (GEC output).

For Mova

How these ideas could serve Mova, our small open language model — its files, stages and tests:

  • I1 (tree): Parse both the learner text and its correction into UD trees and diff the matched subtrees, giving an explainable "attempted but malformed" signal without any bag-of-words scoring.
  • I2 (learn): UD-pattern matchers could propose candidate constructions, and an LLM teacher tier would judge only those, producing silver labels more cheaply.
  • I3 (frames): Purely morphosyntactic constructs can stay in deterministic tree patterns, while politeness forms and other pragmatic constructs go to the prag crate's speech-act and implicature logic.
  • I4 (answer): When grading student answers in school-course tests, report which levelled constructions were used correctly as positive, explainable feedback.
  • I5 (learn): Evaluate frames and world steps on both gold and parser-produced trees to see how much of each downstream error comes from the parser.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Fields, topics and concepts

Cite

Cite as Stefano Banno, Penny Karanasou, Kate Knill and Mark Gales. 2026. Exploiting the English Grammar Profile for L2 grammatical analysis with LLMs. arXiv:2603.17171.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2603.17171 · arXiv 2603.17171

@misc{banno2026exploiting,
  title = {{Exploiting the English Grammar Profile for L2 grammatical analysis with LLMs}},
  author = {Stefano Banno, Penny Karanasou, Kate Knill and Mark Gales},
  year = {2026},
  doi = {10.48550/arxiv.2603.17171},
  eprint = {2603.17171},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2603.17171}
}

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