(Past Tense Universal WORD STRING) means that STRING is the simple-aspect past-tense verb form of WORD for all person-number combinations. The regular simple past is formed from the infinitive verb form with an `-ed' suffix. Since regular forms are generated by the morphology component, verbs in the Cyc lexicon should have a Past Tense Universal entry only if they are irregular. Regular example: `helped'. Irregular example: `ate'.