Mastering complex sentence structure (multiple subordinate clauses and coordination) - German Grammar

Mastering complex sentence structure in German: multiple subordinate clauses and coordination

This guide explains how to build, combine, and read complex German sentences that use more than one subordinate clause (Nebensatz) and coordination (joining clauses with conjunctions). You will learn what subordinate clauses are, how German word order changes inside them, how to nest several subordinate clauses, how coordinating conjunctions behave, and how to avoid the common mistakes learners make. Examples are given in German with English translations.

What is a subordinate clause, and what is coordination?

A subordinate clause (Nebensatz) is a clause that cannot stand alone as a complete sentence; it depends on a main clause (Hauptsatz). Subordinating conjunctions (Subjunktionen) like dass, weil, ob, nachdem, wenn introduce subordinate clauses and push the finite verb to the end of that clause.

Coordination joins two clauses or phrases of equal status with coordinating conjunctions (Konjunktionen) such as und, oder, aber, denn, sondern. Coordinating conjunctions do not change the word order of the clauses they join.

Examples:
- Subordinate clause with dass: Ich glaube, dass er kommt. — I believe that he is coming.
- Coordination with und: Er kommt, und sie bleibt. — He comes, and she stays.

Core word-order rules you must remember

1. Verb position
- Main clause (Hauptsatz): the finite verb normally appears in second position (V2). Example: Er kommt morgen. — He is coming tomorrow.
- Subordinate clause (Nebensatz): the finite verb goes to the end (verb-final). Example: Ich weiß, dass er morgen kommt. — I know that he is coming tomorrow.

2. Commas
German requires commas to set off subordinate clauses. Missing commas are a very common error.
- Correct: Ich bleibe zu Hause, weil ich krank bin.
- Wrong: Ich bleibe zu Hause weil ich krank bin.

3. Coordinating vs subordinating conjunctions
- Coordinating (und, oder, aber, denn, sondern): do not change word order. Example: Ich bin müde, aber ich arbeite weiter. — I am tired, but I continue to work.
- Subordinating (weil, dass, ob, obwohl, nachdem, bevor etc.): send the finite verb to the clause end. Example: Ich arbeite weiter, weil ich fertig werden muss. — I keep working because I must finish.

How to form the main types of subordinate clauses

1. Complement clauses (that-clauses) — "dass"
- Use: to express facts, thoughts, statements, beliefs.
- Structure: main clause, comma, dass + everything else + finite verb at the end.
- Example: Ich glaube, dass sie die Prüfung bestanden hat. — I believe that she passed the exam.

2. Indirect questions — "ob", "wann", "warum", "wie" (and others)

Use: report yes/no questions (ob) or wh-questions (wann, wie, warum, wo, wer).

Example (ob): Er fragt, ob du morgen kommst. — He asks whether you'll come tomorrow.

Example (wann): Ich weiß nicht, wann der Zug ankommt. — I don't know when the train will arrive.

3. Relative clauses (Relativsätze)

Introduced by a relative pronoun (der, die, das, den, dem, dessen, deren) that agrees with the antecedent in gender and number and carries the case required by its role inside the relative clause.

Examples:

Nominative: Der Mann, der dort steht, ist mein Lehrer. — The man who stands there is my teacher.

Accusative: Das Buch, das ich lese, ist spannend. — The book that I'm reading is exciting.

Dative: Die Frau, der ich geholfen habe, ist nett. — The woman whom I helped is nice.

Genitive: Der Autor, dessen Buch ich lese, ist alt. — The author whose book I'm reading is old.

4. Adverbial subordinate clauses (time, cause, condition, concession, purpose, result)

Temporal: nachdem (after), bevor (before), als (when — single past), wenn (when/if — repeated situations/future/conditional)

Nachdem er gegessen hatte, ging er spazieren. — After he had eaten, he went for a walk.

Bevor sie ging, schloss sie das Fenster. — Before she left, she closed the window.

Als ich Kind war, spielte ich viel draußen. — When I was a child, I played outside a lot.

Wenn es regnet, nehme ich einen Schirm. — When/if it rains, I take an umbrella.

Causal: weil, da

Ich bleibe zu Hause, weil ich krank bin. — I stay home because I'm sick.

Concessive: obwohl, obgleich

Obwohl es spät ist, arbeiten wir weiter. — Although it's late, we keep working.

Conditional: wenn, falls

Falls du Zeit hast, komm vorbei. — If you have time, drop by.

Purpose: damit / um ... zu

Ich lerne Deutsch, damit ich in Deutschland arbeiten kann. — I study German so that I can work in Germany.

Ich lerne Deutsch, um in Deutschland arbeiten zu können. — I study German in order to be able to work in Germany. (Use um ... zu when the subject of both clauses is the same.)

Result: sodass (or so dass)

Er arbeitete viel, sodass er sehr müde wurde. — He worked so much that he became very tired.

5. Infinitive clauses with "zu" and participial constructions

Infinitive clause: Ich hoffe, bald kommen zu können. (more natural: Ich hoffe, bald kommen zu können / Ich hoffe, dass ich bald kommen kann.)

More natural example: Er versucht, das Problem zu lösen. — He tries to solve the problem.

"Ohne zu" and "anstatt zu": Er ging, ohne sich zu verabschieden. — He left without saying goodbye.

6. Reported speech and Konjunktiv (indirect speech)

For reported speech, German often uses Konjunktiv I (Er sagt, er komme morgen.). Everyday German may use dass + indicative instead. Example: Er sagt, dass er morgen kommt. — He says that he'll come tomorrow.

Nesting subordinate clauses (stacking Nebensätze) — how deep can you go?

You can embed subordinate clauses inside other subordinate clauses. Each subordinate clause follows the verb-final rule and is set off with commas.

Example (two levels):
- Ich glaube, dass Maria gesagt hat, dass sie heute nicht kommen kann. — I believe that Maria said that she can't come today.
- Structure: main clause (Ich glaube), outer subordinate introduced by dass (dass Maria gesagt hat), inner subordinate introduced by dass (dass sie heute nicht kommen kann).

Example (three levels, natural use limited):
- Er behauptete, dass sie sagte, dass er ihr geholfen habe. — He claimed that she said that he had helped her.
- Note: Very deep nesting is grammatically possible but becomes hard to process; prefer to simplify or use reported-speech structures.

Coordination with subordinate clauses — patterns and pitfalls

1. Coordinating subordinate clauses introduced by the same conjunction
- You can coordinate subordinate clauses that share the same subordinator.
- Ich weiß, dass er kommt und dass sie bleibt. — I know that he is coming and that she stays.
- You may sometimes omit the repeated dass if the clauses are short and the meaning remains clear:
- Ich weiß, dass er kommt und sie bleibt. (Acceptable, but repeating dass improves clarity with long or complex clauses.)

2. Coordinating subordinate clauses with different subordinators or clause types

Example mixing a complement clause and an adverbial clause:

Ich glaube, dass er kommt, weil er eine Einladung hat. — I believe that he will come, because he has an invitation.

Here the adverbial weil-clause modifies the dass-clause (it gives the reason for the belief that he will come).

3. Coordinating subordinate clause + main clause via coordinating conjunction

Coordinating conjunctions join whole clauses. They do not change word order of the clauses themselves.

Ich weiß, dass er kommt, aber ich kann nicht bleiben. — I know that he is coming, but I cannot stay.

4. "Ob ... oder" inside subordinate clauses

You can use or (oder) inside an ob-clause or other subordinate clause:

Ich weiß nicht, ob er kommt oder (ob) er bleibt. — I don't know whether he will come or stay. (Repeating ob is optional for clarity.)

5. When to repeat the conjunction

Repeat the subordinating word (dass, ob, ob ... oder ...) when clauses are long, have different subjects, tenses, or when omitting it would make parsing hard. Repetition is a clarity device rather than a strict requirement in many cases.

Special cases with verb clusters, separable verbs, modals and double infinitives

1. Perfect and pluperfect in subordinate clauses
- The finite auxiliary moves to the end of the subordinate clause.
- Main clause (perfect): Er hat das Buch gelesen. — He has read the book.
- Subordinate clause: Ich weiß, dass er das Buch gelesen hat. — I know that he has read the book.
- Pluperfect: Nachdem er das Buch gelesen hatte, ... — After he had read the book, ...

2. Modal verbs and double infinitives (note: prefer preterite to avoid awkward forms)

In spoken/written German, the perfect of modal verbs often uses a double infinitive: Er hat das tun müssen. — He has had to do that.

In subordinate clauses this creates long verb clusters at the end: Ich glaube, dass er das tun müssen hat. — This is grammatically possible but clumsy; speakers often use preterite: Ich glaube, dass er das tun musste.

Tip: Use the simple past (Präteritum) for modals when possible: Ich glaubte, dass er das tun musste.

3. Separable verbs in subordinate clauses
- A separable verb in a finite form separates the prefix and puts it at the end of the clause as part of the verb phrase.
- Main clause: Er ruft mich an. — He calls me (on the phone).
- Subordinate clause: Ich weiß, dass er mich anruft. — I know that he is calling me.
- With infinitives + zu: Ich hoffe, ihn anrufen zu können. — I hope to be able to call him.

Punctuation rules and comma placement

- Always place a comma before a subordinate clause.
- Correct: Er sagt, dass er kommt.
- Relative clauses are always separated by commas in German (unlike English where commas depend on restrictive vs non-restrictive).
- Das Auto, das ich gekauft habe, ist rot. — The car that I bought is red.
- When a subordinate clause starts the sentence, follow it with a comma, and the main clause follows with normal V2 order.
- Wenn es regnet, gehen wir nicht spazieren. — If it rains, we do not go for a walk.
- Multiple consecutive subordinate clauses are each separated by commas. Example:
- Weil Maria gesagt hat, dass sie heute nicht kommen kann, und weil Peter ebenfalls verhindert ist, haben wir das Treffen abgesagt. — Because Maria said that she cannot come today, and because Peter is also prevented, we canceled the meeting.

Common mistakes and how to fix them

Mistake 1: Forgetting the comma before a Nebensatz
- Wrong: Ich glaube dass er recht hat.
- Correct: Ich glaube, dass er recht hat.

Mistake 2: Using English word order inside a Nebensatz (not putting the verb at the end)
- Wrong: Ich bleibe zu Hause, weil ich am Fieber habe.
- Correct: Ich bleibe zu Hause, weil ich Fieber habe. (or: weil ich ein Fieber habe.)

Mistake 3: Confusing das and dass
- "das" is an article or pronoun; "dass" is a conjunction.
- Wrong: Ich weiß das er kommt.
- Correct: Ich weiß, dass er kommt.

Mistake 4: Wrong case in relative pronoun
- Wrong: Das ist der Mann, den ich geholfen habe.
- Correct: Das ist der Mann, dem ich geholfen habe. — "helfen" takes dative.

Mistake 5: Using "sondern" without a preceding negation
- Wrong: Er ist groß, sondern schlank.
- Correct: Er ist nicht groß, sondern schlank. — "sondern" connects an alternative after a negative.

Mistake 6: Not repeating conjunctions when needed for clarity
- Unclear: Ich weiß, dass er kommt und sie bleibt. (Ambiguous if parsing is hard.)
- Clearer: Ich weiß, dass er kommt und dass sie bleibt.

Quick reference / cheat sheet

- Subordinator → verb-final: dass, weil, ob, obwohl, nachdem, bevor, wenn, damit, als (= when single past event).
- Coordinator → no change of word order: und, oder, aber, denn, sondern.
- Commas required before subordinate clauses and around relative clauses.
- Relative pronouns change form by gender, number and case (der/die/das/den/dem/dessen/deren).
- When nesting clauses, keep the verb-final rule in each subordinate clause; repeat conjunctions when helpful.

Glossary (short and simple)

- Nebensatz (subordinate clause): a clause that depends on a main clause; finite verb at the end.
- Hauptsatz (main clause): a complete clause on its own; finite verb usually V2.
- Subjunktion (subordinating conjunction): words like dass, weil, ob that introduce Nebensätze.
- Konjunktion/Koordinierende Konjunktion (coordinating conjunction): und, oder, aber, denn, sondern — they connect equal elements.
- Relativpronomen (relative pronoun): der/die/das etc., introduce relative clauses and reflect gender/number/case.
- V2: verb-second word order typical for main clauses.

A long example with a breakdown

Sentence:
Weil Anna gestern gesagt hat, dass sie das Projekt nicht rechtzeitig fertigstellen wird, und weil ihr Kollege krank ist, haben die Projektleiter beschlossen, die Frist zu verschieben.

Translation:
Because Anna said yesterday that she will not finish the project on time, and because her colleague is ill, the project managers decided to postpone the deadline.

Breakdown:
- "Weil Anna gestern gesagt hat" — outer adverbial Nebensatz (cause) starting the sentence; notice the comma after the clause and that "hat" appears before the comma that precedes the inner dass-clause.
- "dass sie das Projekt nicht rechtzeitig fertigstellen wird" — inner complement Nebensatz introduced by dass; the finite verb (wird) is at the end of this inner clause.
- "und weil ihr Kollege krank ist" — a second adverbial Nebensatz coordinated with the first (und + subordinate); again comma follows.
- "haben die Projektleiter beschlossen, die Frist zu verschieben." — main clause with verb in second position. "die Frist zu verschieben" is an infinitive clause (zu + infinitive) acting as object of "beschlossen".

Why this is correct and clear:
- Each subordinate clause uses verb-final order.
- Commas separate the subordinate clauses and set them off from the main clause.
- Coordination (und) joins two subordinate clauses of the same type (two reasons).

Final tips

- Read complex German sentences from the end toward the beginning when you practice: verbs often sit at the clause end, and that tells you when a subordinate clause ends.
- When writing, use commas carefully. When in doubt, repeat the subordinating conjunction (dass, ob) to keep things clear.
- If a sentence becomes too nested and hard to follow, split it into shorter sentences or use punctuation and clarifying repetition.
- Prefer the simple past for modal verbs in subordinate clauses to avoid awkward double-infinitive perfect forms.

If you want, I can give you a set of annotated example sentences of progressive difficulty (with parsing tips) so you can practice recognizing clause boundaries and verb clusters.