A German preposition does something English prepositions never do: it forces the noun phrase after it into a particular grammatical case. In the house, for the man, with my friend — in English the noun looks the same after every preposition. In German, für den Mann, mit dem Mann, wegen des Mannes each show a different case ending, and the difference is dictated entirely by the preposition, not by the meaning of the sentence. This page gives you the master map: the four groups every German preposition falls into, and the single mental habit that makes case selection automatic.
The core principle: the preposition assigns the case
This is the insight to internalize before anything else. The case after a preposition is a fixed lexical property of that preposition. It does not depend on what the noun means, on whether there is motion, or on whether the phrase is the subject or object of the clause. Für simply is an accusative preposition; mit simply is a dative preposition. You do not reason your way to the case — you memorize it as part of the word, exactly as you memorize a noun's gender.
Das Geschenk ist für meinen Bruder.
The present is for my brother. (für → accusative: meinen Bruder)
Ich komme mit meinem Bruder.
I'm coming with my brother. (mit → dative: meinem Bruder)
Notice that Bruder is the same person in both sentences, doing nothing different — only the preposition changed, and with it the case. That is the whole logic.
Why this is hard for English speakers
English lost its case system on nouns centuries ago, so an English speaker has no instinct that a preposition could demand anything of the noun. The transfer error is predictable: learners pick the right preposition but leave the article in its dictionary (nominative) form — für der Mann instead of für den Mann. The fix is not to think harder mid-sentence; it is to learn each preposition pre-tagged with its case, so the ending comes out attached.
The four groups
Every German preposition belongs to one of four groups by the case it governs.
| Group | Members (core) | Case | Example |
|---|---|---|---|
| Accusative-only | durch, für, gegen, ohne, um | accusative | durch den Park |
| Dative-only | aus, bei, mit, nach, seit, von, zu | dative | mit dem Bus |
| Two-way (Wechsel) | an, auf, hinter, in, neben, über, unter, vor, zwischen | accusative for motion / dative for location | in die Stadt / in der Stadt |
| Genitive | während, wegen, trotz, statt (anstatt) | genitive | wegen des Wetters |
1. Accusative-only prepositions
The smallest closed set: durch, für, gegen, ohne, um. They never alternate. Whatever the meaning — spatial, temporal, abstract — the case stays accusative.
Wir sind den ganzen Nachmittag durch die Altstadt gelaufen.
We walked through the old town all afternoon. (durch → accusative)
Ohne dich wäre der Abend nur halb so schön gewesen.
Without you the evening would only have been half as nice. (ohne → accusative)
2. Dative-only prepositions
aus, bei, mit, nach, seit, von, zu are the workhorse dative set. Many of the highest-frequency prepositional phrases in the language — mit dem Auto, zu Hause, nach der Arbeit, bei meinen Eltern — sit here.
Nach der Arbeit gehe ich noch kurz zu meiner Schwester.
After work I'll drop by my sister's place. (nach → dative; zu → dative)
Seit einem Jahr wohne ich bei meinen Großeltern.
I've been living at my grandparents' for a year. (seit + bei → dative)
3. Two-way prepositions (Wechselpräpositionen)
The nine an, auf, hinter, in, neben, über, unter, vor, zwischen are the only prepositions that switch case — and they switch on a clear rule. Accusative signals motion into a new place (the "where to?" question, wohin?); dative signals a static location (the "where?" question, wo?).
Ich hänge das Bild an die Wand.
I'm hanging the picture onto the wall. (motion → accusative: an die Wand)
Das Bild hängt an der Wand.
The picture is hanging on the wall. (location → dative: an der Wand)
The deeper logic: accusative is the case of the directly affected goal of an action, so motion toward a destination takes it; dative marks a stable setting in which something simply is. This is the one group where you genuinely apply a test, the motion test, rather than relying on a memorized list.
4. Genitive prepositions
während (during), wegen (because of), trotz (despite), (an)statt (instead of) head a larger formal group. They take the genitive in careful and written German.
Während des Vortrags hat sein Handy dreimal geklingelt.
During the lecture his phone rang three times. (während → genitive: des Vortrags)
Trotz des schlechten Wetters sind wir wandern gegangen.
Despite the bad weather we went hiking. (trotz → genitive)
In casual speech, many of these increasingly take the dative instead (wegen dem Wetter) — a shift discussed on the dedicated genitive-prepositions page. In formal writing (formal), keep the genitive.
Contractions: preposition + article fused
Several preposition–article pairs routinely fuse into a single contracted word. These are not optional shortcuts; the contracted form is the default, and spelling out the full preposition + article is often emphatic or even wrong. Get the spelling exactly right:
| Full form | Contraction | Example |
|---|---|---|
| in dem | im | im Garten |
| in das | ins | ins Kino |
| an dem | am | am Montag |
| an das | ans | ans Meer |
| zu dem | zum | zum Arzt |
| zu der | zur | zur Schule |
| bei dem | beim | beim Bäcker |
| von dem | vom | vom Bahnhof |
Am Montag fahren wir ans Meer.
On Monday we're driving to the seaside. (am = an dem; ans = an das)
Ich war beim Arzt und gehe jetzt noch zur Apotheke.
I was at the doctor's and I'm going to the pharmacy now. (beim = bei dem; zur = zu der)
How the groups connect to the rest of the grammar
Prepositions are not an isolated topic — they are where case, motion, and verb valency all meet. Many verbs demand a specific preposition (warten auf + accusative, denken an + accusative, sich freuen über + accusative); there the preposition is part of the verb's frame and its case is again fixed. Adjectives and nouns do the same (stolz auf, die Angst vor). Once you have the four-group map in your head, those constructions stop looking like exceptions and start looking like the same principle applied: the governing word fixes the case.
Common Mistakes
❌ Das ist für der Mann.
No case adjustment — für is accusative, so the article must be 'den', not the dictionary form 'der'.
✅ Das ist für den Mann.
That's for the man.
❌ Ich fahre mit der Bus.
Wrong case — mit always takes the dative, so 'dem Bus'.
✅ Ich fahre mit dem Bus.
I'm going by bus.
❌ Ich gehe in der Stadt.
If you mean going there, this is the wrong case — motion into a place needs the accusative.
✅ Ich gehe in die Stadt.
I'm going into town. (motion → accusative)
❌ Ich gehe in dem Kino.
Wrong/clumsy — with motion 'into', use the accusative contraction ins, not the dative im.
✅ Ich gehe ins Kino.
I'm going to the cinema.
❌ Wegen das Wetter bleiben wir zu Hause.
Missing genitive — careful German takes 'des Wetters' after wegen.
✅ Wegen des Wetters bleiben wir zu Hause.
Because of the weather we're staying home.
Key Takeaways
- A German preposition fixes the case of the noun after it; the case is a lexical property of the word, not of the meaning.
- Four groups: accusative (durch, für, gegen, ohne, um), dative (aus, bei, mit, nach, seit, von, zu), two-way (an, auf, hinter, in, neben, über, unter, vor, zwischen), genitive (während, wegen, trotz, statt).
- Only the two-way group alternates — accusative for motion, dative for location.
- Learn each group as a case-tagged chant so the ending comes out automatically.
- Memorize the everyday contractions exactly: im, ins, am, ans, zum, zur, beim, vom — and remember they still carry their case.
Now practice German
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Start learning German→Related Topics
- Accusative Prepositions in UseA2 — The meanings and idioms of durch, für, gegen, ohne and um across space, time and abstraction — including the precise um/gegen split for clock time and the bare-noun rule after ohne.
- Dative Prepositions in UseA2 — The everyday dative prepositions — aus, bei, mit, nach, seit, von, zu — what each one means and how to use them naturally.
- Two-Way Prepositions: Spatial MeaningsB1 — What the nine two-way prepositions actually mean in space — and why German splits 'on/at/in' three ways with an, auf, and in.
- Genitive Prepositions in UseB2 — The genitive prepositions — wegen, trotz, während, statt and the formal set — their meanings, and the genitive-vs-dative register signal.
- Preposition + Article ContractionsA2 — How German fuses prepositions with definite articles into single words like im, ins, zum, and zur — when the contraction is obligatory and when keeping them apart signals a demonstrative.
- Verbs with Fixed PrepositionsB1 — The large class of German verbs that govern a fixed preposition with a fixed case (warten auf + Akk., teilnehmen an + Dat.) — why the preposition is never the literal English one and the two-way case is lexically frozen.