An irregular verb is one that does not take the -ed ending for the Past Simple and Past Participle forms. Some irregular verbs do not change; put put put, while others change completely; buy bought bought, etc.
Irregular verbs fall into 5 categories:
See Also: Auxiliary Verb; Ditransitive Verb; Dynamic Verb; Finite Verb; Inchoative Verb; Intransitive Verb; Modal Verb; Non-finite Verb; Phrasal Verb; Regular Verb; Stative Verb; Transitive Verb; Verb Group; Verb Phrase
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