Regular verbs follow a pattern ( lernen -> gelernt ), but irregular verbs are the pain point. By highlighting the Past Participle in bold or a different color, the user can scan the list quickly to identify "danger words" that require extra study (e.g., denken -> gedacht or wissen -> gewusst ).
These lists typically highlight the 200+ verbs that undergo stem changes in different tenses. 1000 most common german verbs pdf