Modal Verbs in German

Modal verbs (Modalverben) in German modify the meaning of another verb to express ability, permission, obligation, desire, or possibility. The six German modal verbs are können (can), müssen (must), dürfen (may), sollen (should), wollen (want), and möchten (would like, which is grammatically a Konjunktiv II form of mögen but functions as a modal).

In present tense conjugation, modal verbs undergo a stem vowel change in the singular forms (except for sollen) and do not take personal endings in the first and third person singular (e.g., ich kann, er kann). In a main clause, the modal verb occupies the second position (V2) and conjugates, while the main verb remains in the infinitive form and is placed at the absolute end of the sentence.

Modal verbs are essential for daily interaction. A common learner error is conjugating both verbs in the sentence (e.g., saying ich kann spreche Deutsch instead of the correct ich kann Deutsch sprechen). Another frequent mistake is adding the personal ending -t to the third person singular, producing incorrect forms like er musst or sie kannt instead of the correct er muss and sie kann.