Relative Clauses with Prepositions and wo-Forms

When a relative clause hinges on a preposition — the team *with which I work, the reason **for which he left, the topic **about which we argued — German parts ways sharply with everyday English. English casually strands the preposition at the end of the clause (the team I work *with) and drops the pronoun; German does neither. The preposition is pied-piped to the front of the clause, sits directly before the relative pronoun, and governs its case. For non-personal antecedents a second route opens up: the fused wo(r)-compound (worüber, womit, woran). This page goes beyond the basic rule (covered on the Pronouns prepositional-relatives page) to the part learners actually struggle with at B2: which form to choose, and when, and how register and animacy decide.

The non-negotiable: the preposition leads, never trails

In German the preposition and the relative pronoun form an inseparable unit that sits at the very front of the clause, right after the opening comma. The verb still goes to the end. There is no register, no dialect, no informal shortcut in which German strands the preposition — this is not a formal-versus-casual choice the way it is in English, where the man to whom I spoke (formal) and the man I spoke to (casual) are both fine. In German only the front-loaded version exists.

The phrase der Grund, aus dem … ("the reason for which") is worth fixing in memory: German expresses "the reason why / for which" with aus dem (or weshalb / weswegen), not with a stranded preposition and never with für das in this idiom.

Case after the preposition: a B2 refresher with the two-way trap

The preposition — not the verb inside the clause — fixes the case. Accusative prepositions (für, ohne, gegen, um, durch) force the accusative; dative prepositions (mit, nach, aus, bei, von, zu, seit, gegenüber) force the dative. The genuine difficulty at B2 is the two-way prepositions (in, an, auf, über, unter, vor, hinter, neben, zwischen), which still obey the motion test inside the relative clause: dative for a static location, accusative for a direction or goal.

The first pair is the classic two-way contrast transplanted into a relative clause: same preposition auf, same antecedent Regal, but stehen (rest) takes dative dem while stellen (place) takes accusative das. Apply the motion test exactly as you would in a main clause. In the third example the case comes from the fixed government of the verb streiten über (+ accusative), a reminder that many verbs lock a particular preposition and case as a unit.

The wo(r)-compound: a lighter route for things

When the antecedent is a thing, idea, or situation — never a person — you may collapse preposition + pronoun into one fused word: a wo(r)-compound. Insert -r- when the preposition begins with a vowel, to break the hiatus: über das → worüber, an dem → woran, auf das → worauf, in dem → worin; with a consonant there is no -r-: mit dem → womit, von dem → wovon, für das → wofür, durch das → wodurch.

For each of these, the explicit preposition + das/dem version means exactly the same thing. So which do you use?

The choice: animacy first, then register

Two factors decide between wo(r)-compound and preposition + der/die/das.

Factor 1 — animacy (this is absolute). wo(r)-compounds are only for non-personal antecedents. With a person, you must use preposition + relative pronoun; womit, worüber, woran can never refer to a human being. This mirrors the same animacy split that governs the everyday da-compounds and wo-questions: German systematically refuses to fold a person into a wo-/da- form.

Factor 2 — register and style (this is a preference, not a rule). When the antecedent is a thing and both forms are grammatical, the wo(r)-compound is the lighter, more idiomatic everyday choice (informal/neutral), especially in speech and with abstract referents. The explicit preposition + das/dem is (formal) and slightly more precise; writers reach for it when the relation must be unambiguous or when wo(r)- would sound clumsy. Some compounds — wovor, wonach — can feel stiff or ambiguous, so the explicit form is often clearer.

There is also a regional and stylistic spread: in casual southern and spoken German you will sometimes hear wo used as an all-purpose relative particle (der Mann, wo das gesagt hat) — this is (regional/nonstandard) and should be recognised but never produced.

Why English habits sabotage you here

Two English instincts cause almost all the errors. First, English strands the preposition (the house we live in, the team I work with) and most learners carry that straight into German, producing das Haus, das wir wohnen in — which is simply not a possible German sentence. Second, even learners who remember to front the preposition often pick the wrong case, because English prepositional objects show no case at all, so the decision feels invisible. German makes you front the preposition and decline the pronoun for the case that preposition governs. A third, subtler trap: English uses which for both things and the stranded-preposition pattern, so learners reach for the explicit preposition + pronoun even when a wo-compound would sound far more natural — overusing über das where a native speaker would say worüber.

Common Mistakes

Key Takeaways

• German never strands a preposition — it always pied-pipes to the front of the relative clause, before the pronoun. There is no casual alternative.
• The preposition governs the case of the pronoun; for two-way prepositions, the motion test still decides dative (location) vs accusative (direction).
• For thing-antecedents you may fuse preposition + pronoun into a wo(r)-compound (worüber, womit, woran), inserting -r- before a vowel.
• The choice is decided first by animacy (people → preposition + pronoun only), then by register (things: wo-form for everyday style, preposition + pronoun for formal precision).
• womit/worüber and the like can never refer to a person — animacy is the hard line.