Drawing Blue Lines - What can Constraint Grammar do for GEC?

Linda Wiechetek, Kevin Brubeck Unhammer


Abstract
This paper presents the application of rule-based methods for Grammatical Error Correction (GEC) across multiple low-resource languages. We describe new functionality using the Constraint Grammar (CG) formalism, designed for detecting and correcting different types of complex grammatical errors in a range of morphologically complex languages. These errors require transformations such as reordering, word additions/deletions, and alternative choices for multiword suggestions. New perspectives are gained from end-to-end-testing – this work aims to clarify the relationship between the command-line interface used by developers and the user interfaces of our grammar checker plug-in for common word processors. We discuss challenges and solutions in correcting complex errors, with examples from languages like Lule Sámi, Irish, and Greenlandic, enabling linguists to adapt these methods in order to provide accurate and context-aware proofing tools for their own languages in mainstream word processors like Microsoft Word, Google Docs or LibreOffice.
Anthology ID:
2025.cgmta-1.3
Volume:
Proceedings of the 9th Workshop on Constraint Grammar and Finite State NLP
Month:
march
Year:
2025
Address:
Tallinn, Estonia
Editors:
Trond Trosterud, Linda Wiechetek, Flammie Pirinen
Venues:
cgmta | WS
SIG:
Publisher:
University of Tartu Library
Note:
Pages:
19–27
Language:
URL:
https://preview.aclanthology.org/landing_page/2025.cgmta-1.3/
DOI:
Bibkey:
Cite (ACL):
Linda Wiechetek and Kevin Brubeck Unhammer. 2025. Drawing Blue Lines - What can Constraint Grammar do for GEC?. In Proceedings of the 9th Workshop on Constraint Grammar and Finite State NLP, pages 19–27, Tallinn, Estonia. University of Tartu Library.
Cite (Informal):
Drawing Blue Lines - What can Constraint Grammar do for GEC? (Wiechetek & Unhammer, cgmta 2025)
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PDF:
https://preview.aclanthology.org/landing_page/2025.cgmta-1.3.pdf