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A unique subclass of irregular verbs comprises the ( können, müssen, dürfen, sollen, wollen, mögen ) and the auxiliary verbs sein (to be) and haben (to have). While often grouped with strong or mixed verbs, they exhibit unique features. In the present tense, they often change their stem vowel (e.g., können – er kann ; sollen – er soll has no umlaut) and lack personal endings in the first and third person singular. Their Präteritum forms resemble weak verbs but without the -te suffix (e.g., konnte, musste, durfte ). The verb sein is entirely suppletive, drawing its forms from different roots ( ist, war, gewesen ), making it the most irregular verb in the language. Mastering these nine verbs is non-negotiable, as they form the backbone of complex sentence structures.
German irregular verbs, also known as "unregelmäßige Verben," are verbs that do not follow the standard conjugation patterns of regular verbs in the German language. Unlike regular verbs, which can be easily conjugated by adding specific endings to the verb stem, irregular verbs have unique and often unpredictable changes in their stem and endings. german irregular verbs