Syntax as a Rosetta Stone: Universal Dependencies for In-Context Coptic Translation

Abhishek Purushothama, Emma Thronson, Alexia Guo, Amir Zeldes


Abstract
This paper proposes a novel in-context learning approach to support low resource machine translation for the Coptic language, using prompts based on Universal Dependencies parses of input sentences. Building on existing work using bilingual dictionaries to support inference for vocabulary items, we add several representations of syntactic analyses to our inputs, specifically exploring the inclusion of raw parser outputs, verbalizations of parses in plain English, and explanations of specific difficult constructions identified in input subgraphs and how they can be translated. Our results show that while syntactic information alone is not as useful as dictionary-based glosses, combining retrieved dictionary items with syntactic information achieves significant gains across model sizes, achieving new state-of-the-art results for the language.
Anthology ID:
2026.findings-acl.1803
Volume:
Findings of the Association for Computational Linguistics: ACL 2026
Month:
July
Year:
2026
Address:
San Diego, California, United States
Editors:
Maria Liakata, Viviane P. Moreira, Jiajun Zhang, David Jurgens
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
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Pages:
36176–36195
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URL:
https://preview.aclanthology.org/ingest-acl/2026.findings-acl.1803/
DOI:
Bibkey:
Cite (ACL):
Abhishek Purushothama, Emma Thronson, Alexia Guo, and Amir Zeldes. 2026. Syntax as a Rosetta Stone: Universal Dependencies for In-Context Coptic Translation. In Findings of the Association for Computational Linguistics: ACL 2026, pages 36176–36195, San Diego, California, United States. Association for Computational Linguistics.
Cite (Informal):
Syntax as a Rosetta Stone: Universal Dependencies for In-Context Coptic Translation (Purushothama et al., Findings 2026)
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https://preview.aclanthology.org/ingest-acl/2026.findings-acl.1803.pdf
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