However, there are verbs for which past participle formation is irregular (e.g. sleep, slept; write, wrote) and within these irregular verbs there are subregular classes (as well as purely lexical exceptions, such as go, went).
Source: wiktionary
Subregular
Synonyms for "subregular"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.