Separate reference from grammatical role
Start with two sentences: Ich suche den Kollegen. Der Kollege hat den Schlüssel. Combine them as Ich suche den Kollegen, der den Schlüssel hat. The antecedent den Kollegen is accusative in the main clause. The relative pronoun is nevertheless nominative because the colleague has the key inside the relative clause.
Reverse the role: Das ist der Kollege, den ich gestern angerufen habe. Now ich is the relative-clause subject and the colleague is the accusative object of anrufen. Do not copy the antecedent’s ending mechanically. The finite verb goes at the end of the relative clause; in the second example the whole ending is angerufen habe.
Choose a relative pronoun in three decisions
- Antecedent
den Kollegen
Masculine singular; its main-clause case does not carry over.
- Role inside the clause
Der Kollege hat den Schlüssel.
The colleague is the subject, so choose nominative.
- Combined clause
den Kollegen, der den Schlüssel hat
Der links the masculine singular antecedent to its subject role.
Use the complete pronoun chart
| Case | Masculine | Neuter | Feminine | Plural |
|---|---|---|---|---|
| Nominativ | der | das | die | die |
| Akkusativ | den | das | die | die |
| Dativ | dem | dem | der | denen |
| Genitiv | dessen | dessen | deren | deren |
The order of columns matters: identify masculine, neuter, feminine or plural first, then select the case row. Notice dative plural denen rather than the article form den. The genitives are dessen and deren, not des and der. Gender is grammatical: a person can be referred to through a neuter noun such as das Mitglied.
Keep a required preposition with the pronoun
Das ist die Kollegin, mit der ich die Schicht tausche. The feminine antecedent supplies gender; mit supplies dative. Write the preposition before the relative pronoun. English can leave “with” at the end; this German pattern cannot.
For places, distinguish location from direction: das Büro, in dem ich arbeite; das Büro, in das ich gehe. The same room has different case because the relative clauses express different spatial relations. Standard German does not use wo as an all-purpose substitute for every person or object. Keep the explicit preposition when the verb requires one: die Frage, über die wir sprechen.
Build a noun phrase after dessen or deren
Die Nachbarin, deren Hund oft bellt, zieht um. Choose deren from feminine die Nachbarin, not from masculine der Hund. The dog is the subject of the relative clause; the possessive connection is expressed by genitive deren. No extra definite article is needed before Hund.
The noun after dessen/deren still receives its own case: die Nachbarin, mit deren neuem Fahrrad ich fahre. Here mit makes the bicycle phrase dative, so the adjective is neuem. Deren itself stays unchanged. Compare der Nachbar, dessen neues Fahrrad hier steht: masculine antecedent, hence dessen, but the bicycle phrase is nominative.
Was, free relatives and clear boundaries
After a general neuter expression, was is common: Alles, was du brauchst, liegt bereit; Das Wichtigste, was fehlt, ist ein Plan. To refer to the entire preceding statement: Der Termin fällt aus, was uns Zeit spart. The reference is the cancellation, not a particular noun. A prepositional relationship can require worüber or another appropriate wo(r)- form: Der Termin fällt aus, worüber sich niemand freut.
A free relative has no separate noun antecedent: Wer Hilfe braucht, kann mich anrufen. Case still belongs to each clause: Wem ich vertraue, dem gebe ich den Schlüssel. Wem follows vertrauen; dem follows geben.
German separates relative clauses with commas even when they identify which person is meant. For an inserted clause, close both sides: Die Mappe, die auf dem Tisch liegt, gehört mir. Do not omit the relative pronoun as English sometimes does.
Check your decisions: eight explained tasks
1. Choose: Ich kenne den Fahrer, __ heute einspringt.
der. The driver is the subject of einspringt; masculine singular nominative is required, despite accusative den Fahrer outside the clause.
2. Choose: Die Fahrerin, __ wir suchen, ist schon da.
die. Wir is the subject, and the driver is the accusative object of suchen; feminine accusative is die.
3. Complete: Die Gäste, mit __ wir sprechen, warten draußen.
denen. Mit requires dative and the antecedent is plural. The relative form is not den.
4. Combine: Das ist das Büro. Ich arbeite in dem Büro.
Das ist das Büro, in dem ich arbeite. Location with in uses dative here, and Büro is neuter.
5. Complete for the neighbour’s dog: Die Nachbarin, __ Hund bellt, ist freundlich.
deren. The owner named by the antecedent is feminine. The gender of Hund does not select the genitive relative pronoun.
6. Choose the adjective: die Nachbarin, mit deren neu__ Fahrrad ich fahre
neuem. The bicycle phrase is dative after mit; deren does not supply a definite-article ending to the adjective.
7. Refer to the whole event: Der Kurs beginnt später, __ mir gut passt.
was. What suits me is the later start as a whole, not a noun such as Kurs.
8. Complete both cases: __ ich vertraue, __ gebe ich den Schlüssel.
Wem ich vertraue, dem gebe ich den Schlüssel. Both verbs require a dative person here. In another construction the two cases could differ; neither is copied automatically.
Describe a place without naming it
Write a short message describing a shared workplace or learning space. Include a person who does something, an object you need, a person with whom you work, and an owner expressed through dessen or deren. Finish with a comment on a whole event using was. For each relative pronoun, write a private check: antecedent, gender/number, role inside its clause. Remove those notes and read the message aloud. Keep the references close enough that a listener can identify them.
Use the rule in a wider context
Review das versus dass when identifying a relative pronoun. For the noun phrases inside these clauses, use genitive forms and adjective endings.
Questions about this topic
Can I omit the relative pronoun?
Not in the ordinary German relative-clause pattern taught here. English clauses such as “the book I bought” need an explicit relative element in German.
Does dessen change when the following noun is plural?
No. Dessen is selected by a masculine or neuter singular antecedent. The following possessed noun phrase has its own number and case.
Sources and further learning
- IDS: Relativsätze mit den Pronomen der, die, das
- IDS: Erweiterung von Nominalphrasen mit Attributsätzen
- Hueber: Akademie Deutsch — Relativsätze
- IDS: Relativsätze mit wer
- IDS: Relativ-Elemente
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