German relative clauses for B1-B2: the two-step method for der, die, das and denen, plus prepositions, dessen, deren, wo, was, and exam traps.
German relative clauses (Relativsätze) let you fold two short sentences into one. Ich habe einen Freund. Er wohnt in Berlin becomes Ich habe einen Freund, der in Berlin wohnt (I have a friend who lives in Berlin). At B1 you can no longer avoid them: examiners for Goethe and telc score the range of your sentence structures, and a text built only from short main clauses reads as A2 work no matter how correct it is.
The good news: relative clauses run on one small table and one two-step decision. The hard part is that half of the decision comes from the main clause and half from the relative clause. This guide drills that split, then covers prepositions, dessen/deren, wo, was, and the traps that cost B1 candidates marks.
What German relative clauses do and why examiners reward them
A relative clause adds information about a noun without starting a new sentence. It sits directly after the noun it describes, begins with a relative pronoun such as der, die or das, and sends the conjugated verb to the end.
- Das ist der Kurs. Ich habe den Kurs gebucht. → Das ist der Kurs, den ich gebucht habe. (That is the course that I booked.)
- Die Lehrerin ist nett. Sie kommt aus Wien. → Die Lehrerin, die aus Wien kommt, ist nett. (The teacher, who comes from Vienna, is nice.)
Why this matters in the exam: the writing and speaking criteria at B1 and B2 reward varied sentence structure. A letter that connects its ideas with relative clauses and subordinate clauses scores better on range than one that repeats und and dann. The Schreiben section guide shows where structure points come from; relative clauses are one of the cheapest ways to earn them, because you already know all the words involved.
The two-step method for choosing the relative pronoun
Every relative pronoun is decided in two steps: gender and number come from the noun in the main clause, case comes from the pronoun's job inside the relative clause. Never take the case from the main clause. This single rule fixes the most common relative clause error at B1.
Work through it slowly with three examples.
- Das ist der Lehrer, ___ sehr streng ist. Step 1: der Lehrer is masculine singular, so you stay in the masculine column. Step 2: inside the relative clause, the pronoun is the subject of ist, so it takes Nominativ: der. Das ist der Lehrer, der sehr streng ist. (That is the teacher who is very strict.)
- Das ist der Lehrer, ___ ich sehr mag. Step 1: still masculine singular. Step 2: inside the clause, ich is the subject and the pronoun is the direct object of mögen, so Akkusativ: den. Das ist der Lehrer, den ich sehr mag. (That is the teacher whom I like a lot.)
- Die Studentin, ___ ich mein Wörterbuch geliehen habe, besteht die Prüfung. Feminine singular; leihen takes a dative person, so Dativ: der. (The student I lent my dictionary to passes the exam.)
In the second and third examples the noun sits in a different case in the main clause. That is normal, and it is exactly where learners slip. Step 2 only asks: what is the pronoun doing inside its own clause? If case selection itself feels shaky, review the four German cases first; the two-step method assumes you can name a verb's case quickly.
The relative pronoun table you need to memorise
The relative pronouns are almost identical to the definite articles, so you already know most of the table. Only three forms differ: denen (Dativ plural), dessen (Genitiv masculine and neuter), and deren (Genitiv feminine and plural).
| Case | Maskulin | Feminin | Neutrum | Plural |
|---|---|---|---|---|
| Nominativ | der | die | das | die |
| Akkusativ | den | die | das | die |
| Dativ | dem | der | dem | denen |
| Genitiv | dessen | deren | dessen | deren |
Two mechanical rules travel with every relative clause, and examiners check both:
- The conjugated verb goes to the end of the relative clause. Der Film, den wir gestern gesehen haben, war langweilig. Not den wir haben gesehen gestern.
- Commas are mandatory. German sets a comma before every relative clause, and a second comma after it if the main clause continues: Die Frau, die neben mir wohnt, arbeitet im Krankenhaus. In the writing paper a missing comma here is a real error, not a style choice.
Relative clauses with prepositions
When the verb in the relative clause needs a preposition, the preposition moves to the front of the clause and the pronoun takes the case that preposition demands. The order is always preposition first, then pronoun.
- Die Frau, mit der ich arbeite, ist sehr freundlich. (The woman with whom I work is very friendly.) mit forces Dativ, feminine: der.
- Das Haus, in dem ich wohne, ist ziemlich alt. (The house in which I live is quite old.) Location, so in takes Dativ, neuter: dem.
- Der Freund, auf den ich warte, kommt aus Kathmandu. (The friend I am waiting for is from Kathmandu.) warten auf takes Akkusativ, masculine: den.
The two-step method still runs underneath: gender and number from the main-clause noun, case from the preposition. That means you must know which case each preposition governs, and for two-way prepositions like in and auf, whether the verb describes position or movement. The guide to German prepositions and their cases covers exactly that.
One thing English allows that German never does: dropping the pronoun or leaving the preposition at the end. The woman I work with has no German equivalent without mit der. Say the preposition and the pronoun every time.
Dessen, deren, wo and was
Four special forms handle possession, places, and indefinite words. B2 texts use all of them; B1 candidates who control even dessen/deren stand out.
Dessen and deren for possession
Dessen (after masculine and neuter nouns) and deren (after feminine and plural nouns) mean "whose". The form depends only on the owner in the main clause.
- Der Mann, dessen Auto vor der Tür steht, ist mein Nachbar. (The man whose car is parked outside is my neighbour.)
- Die Frau, deren Sohn Deutsch lernt, kommt aus Brasilien. (The woman whose son is learning German comes from Brazil.)
- Die Eltern, deren Kinder hier zur Schule gehen, treffen sich am Freitag. (The parents whose children go to school here meet on Friday.)
The trap: dessen and deren replace the article of the following noun. It is der Mann, dessen Auto, never dessen das Auto. If you find yourself writing an article after dessen or deren, delete it.
Wo for places
After a place, wo can replace preposition plus pronoun: die Stadt, wo ich geboren bin means the same as die Stadt, in der ich geboren bin. Both are correct; in der reads slightly more formal and suits the writing paper. After city or country names, wo is standard: Ich lebe jetzt in Berlin, wo die Mieten hoch sind. (I now live in Berlin, where rents are high.)
Was after alles, etwas, nichts and das
After alles, etwas, nichts, das, vieles and superlatives used as nouns, the relative pronoun is was, not das:
- Das ist alles, was ich weiß. (That is everything I know.)
- Es gibt nichts, was mich überrascht. (There is nothing that surprises me.)
- Das war das Beste, was mir passieren konnte. (That was the best thing that could happen to me.)
Was can also refer to a whole clause: Sie hat die Prüfung bestanden, was mich sehr freut. (She passed the exam, which makes me very happy.) That last pattern is a quiet B2 upgrade for your writing.
Common traps at B1 and B2
Most relative clause errors fall into four patterns. Check your own writing against this list before you check anything else.
- Using welcher everywhere. It sounds stiff and has no genitive forms. Default to der/die/das; keep welcher only to avoid a repetition like die, die.
- Copying English "that" with dass. dass is a conjunction (Ich weiß, dass du kommst), never a relative pronoun. "The book that I read" is das Buch, das ich gelesen habe. If the word points back to a noun, it is spelled das.
- Forgetting verb-final position. Under time pressure, learners write the verb in second position out of habit. Reread every relative clause and confirm the conjugated verb is last.
- Taking the case from the main clause. Ich helfe dem Mann, der nebenan wohnt is correct even though the main clause has Dativ: inside the relative clause the pronoun is the subject. Run the two-step method every time, even when the sentence "feels" done.
The fix for all four is the same: targeted repetition until the two-step check runs in seconds. The Grammar Practice sets on SagaDeutsch include relative clause drills at B1 and B2 with instant correction, which is faster feedback than marking your own sentences against a key.
Frequently asked questions
All three are masculine singular; the case changes with the pronoun's job inside the relative clause. der is the subject (der Mann, der dort steht), den is the direct object (der Mann, den ich kenne), and dem is the dative object or follows a dative preposition (der Mann, dem ich helfe; der Mann, mit dem ich spreche). Gender stays fixed; only the case moves.
Use them for possession, where English says "whose". dessen follows masculine and neuter nouns, deren follows feminine and plural nouns: der Mann, dessen Auto; die Frau, deren Sohn. The choice depends only on the owner in the main clause, and the following noun loses its article: never dessen das Auto.
Yes, when the reference is a place. Die Stadt, wo ich wohne and die Stadt, in der ich wohne are both correct; the preposition version reads slightly more formal, which suits exam writing. After city and country names, wo is standard: in Berlin, wo ich studiere. For people or objects, wo is wrong; use the pronoun.
It is grammatical but almost always the worse choice. welcher/welche/welches sounds bureaucratic in modern German, has no genitive forms, and adds nothing that der/die/das does not do. Examiners will not mark it wrong, but a text full of welcher reads unnatural. Reserve it for avoiding a double die, die, and use the article forms everywhere else.
