What Are Modal Verbs?
Modal verbs are auxiliary verbs that modify the meaning of a main verb — expressing concepts like ability, permission, obligation, desire, or supposition. In German, there are six core modal verbs, and they appear in almost every conversation. Learning them well is one of the highest-value investments you can make at the intermediate level.
The Six German Modal Verbs
| Modal verb | Core meaning | Example |
|---|---|---|
| können | can / to be able to | Ich kann Deutsch sprechen. (I can speak German.) |
| müssen | must / to have to | Du musst lernen. (You have to study.) |
| dürfen | may / to be allowed to | Hier darf man nicht rauchen. (Smoking is not permitted here.) |
| wollen | want to | Er will Arzt werden. (He wants to become a doctor.) |
| sollen | should / to be supposed to | Du sollst um 8 Uhr hier sein. (You're supposed to be here at 8.) |
| mögen | to like / may (possibility) | Ich mag Kaffee. (I like coffee.) |
How Modal Verbs Work in a Sentence
German modal verbs follow a key structural rule: the modal verb takes the second position in the sentence, and the main verb moves to the end in its infinitive form.
Ich kann morgen kommen. (I can come tomorrow.)
Wir müssen das Formular ausfüllen. (We have to fill in the form.)
In subordinate clauses, the modal verb moves to the end — after the infinitive:
Ich weiß, dass er kommen kann. (I know that he can come.)
Conjugation Patterns
Modal verbs are irregular in the present tense — notably, the ich and er/sie/es forms are identical and have no ending. Here's können as an example:
- ich kann
- du kannst
- er/sie/es kann
- wir können
- ihr könnt
- sie/Sie können
All six modal verbs follow this same pattern (identical ich/er forms, vowel change in the singular). This is one of the few grammar areas where learning one verb's pattern really does unlock the others.
Common Mistakes and How to Avoid Them
Confusing müssen and sollen
Müssen expresses an inner compulsion or necessity: Ich muss das tun (I have to do that — I need to).
Sollen expresses an external obligation set by someone else: Ich soll das tun (I'm supposed to do that — someone told me to).
The distinction matters: using müssen when you mean sollen can imply you're acting on your own will rather than following instructions.
Confusing wollen and möchten
Wollen expresses a strong, direct wish or intention. Möchten (the Konjunktiv II form of mögen) is softer and more polite — equivalent to "would like to". In a shop or restaurant, Ich möchte einen Kaffee is far more natural than Ich will einen Kaffee, which can sound blunt.
Forgetting the infinitive at the end
A very common beginner error: Ich kann Deutsch ✗ — this is grammatically incomplete in most contexts. The full sentence should be: Ich kann Deutsch sprechen. ✓
Practice Exercises
- Rewrite five sentences from a German text you're reading, replacing the verb with a modal + infinitive construction.
- Translate ten sentences from English to German, deliberately using a different modal each time.
- Listen to a German podcast and note each time you hear a modal verb — which one was used, and why?
Final Thought
Modal verbs unlock a huge range of expression in German. Once you're comfortable with their conjugation and sentence position, you'll find they appear everywhere — making your German sound more natural, nuanced, and native-like almost immediately.