English irregular verbs - Wikipedia
https://en.wikipedia.org/wiki/English_irregular_verbsThe irregular verbs of Modern English form several groups with similar conjugation pattern and historical origin. These can be broadly grouped into two classes – the Germanic weak and strong groups – although historically some verbs have moved between these groups. There are also a few anomalous cases: the verbs be and go, which demonstrate suppletion; the verb do; and the defective modal verbs.
Irregular verbs | - | LearnEnglish - British Council
https://learnenglish.britishcouncil.org › ...Base form, Past tense, Past participle. be, was/were, been. begin, began, begun. break, broke, broken. bring, brought, brought. buy, bought, bought.