Some irregular verbs have the simple past and past participle identical with the infinitive:
There are irregular verbs that have the simple past identical with the past participle, both very different from the infinitive: Most of the irregular verbs conjugate without following the rules in simple past and past participle. There are about 200 English irregular verbs, many of them very common. All the verbs that do not follow the rules above in the conjugation of one or more tenses are called irregular verbs.
