What Modal Verbs Do
Modal verbs express attitude towards an action: ability, obligation, permission, intention or preference. German has six of them, plus one very useful derivative. They share two things — an irregular conjugation and a word-order pattern that puts the main verb at the end.
Conjugation in the Present
Modal verbs are irregular in the singular: the first and third person singular have no ending, and the stem vowel changes.
ich and er are identical
Ich kann and er kann look the same. That is a feature of all modal verbs in the present tense, and it never causes confusion because the pronoun or context disambiguates.The Word-Order Pattern
The modal takes position two and the main verb goes to the end as a bare infinitive. Nothing else changes: no zu, no prefix split.
Ich kann heute nicht kommen.
I cannot come today. [Modal in position 2, infinitive at the end]
Wir müssen früh aufstehen.
We have to get up early. [Separable verb stays whole]
Sie will in Berlin studieren.
She wants to study in Berlin. [Infinitive last]
In a subordinate clause the modal itself moves to the end and follows the infinitive: …, weil ich heute nicht kommen kann.
Each Verb in Detail
können — ability and possibility
Ich kann gut kochen.
I can cook well. [Ability]
Kannst du mir helfen?
Can you help me? [Request]
müssen — necessity
Ich muss jetzt gehen.
I have to go now. [Obligation]
Watch the negation. Nicht müssen means "not have to", not "must not": Du musst nicht kommen means you are not required to come.
dürfen — permission
Darf ich hier rauchen?
May I smoke here? [Asking permission]
Nicht dürfen is the real prohibition: Du darfst hier nicht rauchen means you are not allowed to.
sollen — external obligation and advice
Du sollst mehr Wasser trinken.
You should drink more water. [Advice or instruction from someone else]
Sollen also reports what someone else said you should do, which makes it useful for reported speech.
wollen — intention
Ich will nach Deutschland fahren.
I want to go to Germany. [Strong wish]
mögen and möchten — preference and politeness
Ich mag deutschen Kaffee.
I like German coffee. [mögen + noun]
Ich möchte einen Kaffee, bitte.
I would like a coffee, please. [möchten — the polite form]
möchten is your everyday verb
Möchten is technically the Konjunktiv II of mögen, but it functions as an independent verb and is the normal way to order, request or offer anything politely. Learn its forms separately: ich möchte, du möchtest, er möchte, wir möchten, ihr möchtet, sie möchten.Negation: Two Different "Must Nots"
This is the single most common modal mistake, and it is a meaning error rather than a grammar one.
Brauchen … zu is the natural alternative to nicht müssen, and it is common in spoken German.
Talking About the Past
In speech, modal verbs use the Präteritum rather than the perfect, because the forms are short and frequent.
The double infinitive
When a modal appears in the perfect tense, it forms a double infinitive instead of a participle: Ich habe arbeiten müssen, not Ich habe gemusst. The same happens with können: Ich habe nicht kommen können.
Ich habe gestern länger arbeiten müssen.
I had to work longer yesterday. [Double infinitive at the end]
Modals for Politeness
The past subjunctive forms of modal verbs are the backbone of polite German. See Konjunktiv II for the full system, but these four carry most of the load.
Practice
Rewrite each sentence with the modal in brackets, keeping the word order correct.
- Ich gehe heute ins Kino. (wollen)
- Er kommt morgen nicht. (können)
- Wir stehen früh auf. (müssen)
- Du rauchst hier nicht. (dürfen)
- Ich trinke einen Tee. (möchten)
1. Ich will heute ins Kino gehen. 2. Er kann morgen nicht kommen. 3. Wir müssen früh aufstehen. 4. Du darfst hier nicht rauchen. 5. Ich möchte einen Tee trinken.
Notice the infinitive always closes the clause. [Answers]
Check your clauses
Paste your answers into the Lingaso writing analyser and confirm the infinitive is final in every sentence.FAQ
What is the difference between müssen and sollen?
müssen expresses necessity or a strong obligation, often from circumstances or from yourself; sollen expresses an obligation that comes from someone else, or a recommendation. Du musst lernen is a necessity; du sollst lernen suggests someone told you to.
Does nicht müssen mean must not?
No. Du musst nicht kommen means you do not have to come. The prohibition is du darfst nicht kommen. This distinction is tested constantly and is worth drilling separately.
Why is there no ge- in the perfect tense with modals?
Because modals use a double infinitive: Ich habe arbeiten müssen rather than Ich habe gemusst. The modal stays in its infinitive form at the end of the clause.
Is möchten a separate verb?
Historically it is the Konjunktiv II of mögen, but in modern German it functions as an independent verb and has its own present-tense forms. It is the standard polite way to request or offer something.