Modal verbs, part 1 — können, müssen, wollen

Modal verbs color everything else. They're the "can," "must," "want" of German, and they lock together with a second verb to express what you're able to, have to, or want to do. Three of the big six in this lesson; the other three (dürfen, sollen, mögen) are next.

The shape of a modal sentence

Subject — modal (slot 2) — middle stuff — infinitive (end).

The modal behaves like any verb: it takes the Präsens endings and lands in position 2. The "real" verb — the action — stays as an infinitive and goes to the END of the sentence. This is the verbal bracket pattern you met in the word-order lesson.

Present-tense forms — the irregularity you need to know

All modals share a quirk: they have a different stem in the three singular forms (ich/du/er) than in the plural. The singular forms often look nothing like the infinitive. This is the irregularity; once you know it, you know it.

Three things to notice:

1. ich- and er-forms are identical (no -e, no -t). Ich kann, er kann. This is universal for modals.
2. The umlaut disappears in the singular (können → kann).
3. The plural forms look like regular conjugation with the infinitive as the stem.

Will is NOT future

Heads up: ich will means "I want," not "I will." German uses werden (+ infinitive) for future, not wollen. The lookalike is the number-one trap for English speakers.

müssen and negation — the English trap

"I must not do X" and "Ich muss X nicht" do NOT mean the same thing. Read this slowly.

Nicht müssen = no obligation. Nicht dürfen = prohibition. (You'll meet dürfen formally in the next lesson.)

können — more than just "can"

Können covers three senses English handles with different words:

• Ability: Ich kann schwimmen. I can swim.
• Possibility: Das kann passieren. That can happen.
• Knowledge of a language: Er kann Deutsch. (No infinitive needed — sprechen is implied.)

When the infinitive disappears

Modals are the only verbs that can survive without a second verb when the action is obvious from context. Most often: direction verbs.

You don't have to use these shortened forms — but you'll hear them constantly and should recognize them.

Worked example

Wir können morgen ein Auto für die Reise mieten. We can rent a car for the trip tomorrow.

Walk it through:

• Slot 1: Wir (subject).
• Slot 2: können (modal, conjugated).
• Middle: morgen ein Auto für die Reise (time first, then object + prepositional phrase).
• End: mieten (infinitive).

Notice how even a long sentence keeps the modal-in-2 / infinitive-at-end bracket. Everything else fills the middle.

Common mistakes, named

1. Adding a zu. Ich kann zu schwimmen. ❌ → Ich kann schwimmen. ✓ Modals take bare infinitives. No zu.

2. Putting the infinitive next to the modal. Ich kann schwimmen gut. ❌ → Ich kann gut schwimmen. ✓ Infinitive goes to the end, not anywhere nearby.

3. Translating ich will as "I will." Ich will dir helfen = "I WANT to help you." For future, use werden.

4. Conjugating the ich-form with -e. Ich kanne. ❌ → Ich kann. ✓ Modals skip the usual ich-e.

Mini check

Where this leads

Next: the other three modals. Dürfen (permission), sollen (advice / obligation from outside), mögen (like / preference). Same grammar, different meanings.

Next up: Modalverben, part 2 — dürfen, sollen, mögen.

Test yourself