Are there irregular verbs in Latin?
Several verbs add some of the personal endings of the present system directly to the root,1 or combine two verbs in their inflection. These are called Irregular Verbs. They are sum, volō, ferō, edō, dō, eō, queō, fīō, and their compounds.
Why do irregular verbs exist?
Most irregular verbs exist as remnants of historical conjugation systems. When some grammatical rule became changed or disused, some verbs kept to the old pattern.