Negation is a common and important semantic feature in natural language, yet Large Language Models (LLMs) struggle when negation is involved in natural language understanding tasks. Commonsense knowledge, on the other hand, despite being a well-studied topic, lacks investigations involving negation. In this work, we show that commonsense knowledge with negation is challenging for models to understand. We present a novel approach to automatically augment existing commonsense knowledge corpora with negation, yielding two new corpora containing over 2M triples with if-then relations. In addition, pre-training LLMs on our corpora benefits negation understanding.
@article{arxiv.2604.19921,
title = {Commonsense Knowledge with Negation: A Resource to Enhance Negation Understanding},
author = {Zijie Wang and MohammadHossein Rezaei and Farzana Rashid and Eduardo Blanco},
journal= {arXiv preprint arXiv:2604.19921},
year = {2026}
}