Introduction to Coordinating Conjunctions

The moment you want to say more than one thing in German, you need conjunctions — the small words that connect two sentences or ideas together. Und, aber, oder, denn, and sondern are the five most important coordinating conjunctions in German, and they all share one crucial property: they do not change the word order of the sentence that follows them. This makes them the easiest type of conjunction to learn — and the most essential.

Why Coordinating Conjunctions Matter

You need them from day one: Without conjunctions, every sentence stands alone. With them, you can connect ideas, express contrast, give reasons, and offer alternatives — the building blocks of real conversation.
They do not affect word order: Unlike subordinating conjunctions (weil, dass, obwohl), coordinating conjunctions leave the verb in its normal position 2. This makes them far simpler to use.
sondern vs. aber is one of the most common A2 errors: Both translate as "but" in English, but they are not interchangeable. Getting this distinction right is a clear marker of careful, accurate German.
denn vs. weil causes constant confusion: Both mean "because," but denn keeps normal word order while weil sends the verb to the end. At beginner level, denn is the safer and simpler choice.

Understanding Coordinating Conjunctions

The Five Core Conjunctions

Each conjunction has a specific meaning and use. They all sit between two main clauses and do not move the verb:

Conjunction	Meaning	Use	Example
und	and	Adds information	Ich lerne Deutsch und ich lese gern.
aber	but	Contrasts two true statements	Er ist müde, aber er arbeitet weiter.
oder	or	Offers an alternative	Möchtest du Kaffee oder Tee?
denn	because	Gives a reason (keeps normal word order)	Ich lerne Deutsch, denn ich lebe in Berlin.
sondern	but rather / but instead	Corrects a negation — replaces something false with something true	Er ist nicht müde, sondern krank.

Word Order After Coordinating Conjunctions

This is the key feature that makes coordinating conjunctions easy. After und, aber, oder, denn, and sondern, the second sentence has exactly the same word order as a normal main clause — the verb stays in position 2:

Without conjunction	With conjunction	Verb position in second clause
Ich trinke Kaffee.	Ich trinke Kaffee, und ich esse ein Brötchen.	esse = position 2 ✓
Er kommt nicht.	Er kommt nicht, aber er ruft an.	ruft = position 2 ✓
Ich lerne Deutsch.	Ich lerne Deutsch, denn ich wohne in Berlin.	wohne = position 2 ✓

und — Adding Information

Und is the simplest conjunction — it adds one idea to another. When the subject of both clauses is the same, it can be dropped in the second clause:

Example	Note
Ich lerne Deutsch und ich lese Bücher.	Both subjects stated — more emphatic
Ich lerne Deutsch und lese Bücher.	Subject dropped in second clause — more natural
Er kauft Brot, Butter und Milch.	Listing items — comma before final und is optional in German

aber — Contrasting Two True Statements

Aber connects two statements that are both true but stand in contrast to each other. Both halves of the sentence can be positive or negative — what matters is that they are both valid, just in tension:

Example	What aber signals
Das Buch ist interessant, aber es ist lang.	Both true — interesting AND long
Ich mag Kaffee, aber ich trinke keinen abends.	Both true — likes coffee AND avoids it in evenings
Er ist müde, aber er macht weiter.	Both true — tired AND continuing

oder — Giving an Alternative

Oder presents a choice between two possibilities. It works in statements, questions, and suggestions:

Example	Context
Möchtest du Kaffee oder Tee?	Question — choosing between two options
Wir gehen ins Kino oder wir bleiben zu Hause.	Statement — two alternatives
Kommst du heute oder morgen?	Question about time alternatives

denn — Giving a Reason (Normal Word Order)

Denn means "because" and introduces a reason. Its crucial advantage for beginners is that it keeps normal word order — the verb stays in position 2 in the second clause. This distinguishes it from weil, which sends the verb to the end:

With denn (coord.) — verb stays in position 2	With weil (subord.) — verb goes to end
Ich lerne Deutsch, denn ich lebe in Berlin.	Ich lerne Deutsch, weil ich in Berlin lebe.
Er bleibt zu Hause, denn er ist krank.	Er bleibt zu Hause, weil er krank ist.

Both sentences mean the same thing. At beginner level, denn is easier to use — once you are comfortable with subordinate clauses, you can switch to weil.

sondern — Correcting a Negation

This is the conjunction that most learners get wrong. Sondern means "but rather" or "but instead" — it is only used after a negation in the first clause, to replace the negated idea with the correct one. If the first clause is not negative, you cannot use sondern — use aber instead:

Situation	Correct conjunction	Example
First clause is negative, second replaces the false idea	sondern	Er ist nicht müde, sondern krank.
First clause is negative, second adds a different true statement	aber	Er ist nicht groß, aber er ist stark.
Both clauses are positive — simple contrast	aber	Das Essen ist gut, aber es ist teuer.

The sondern / aber Decision — A Simple Test

Ask yourself: "Is the second clause directly replacing and correcting the negated idea in the first clause?" If yes → sondern. If no → aber.

Sentence	Test	Answer
Er trinkt nicht Kaffee, ___ Tee.	Tea directly replaces the negated coffee	sondern
Er trinkt nicht viel Kaffee, ___ er mag ihn.	Liking it does not replace "not drinking much" — it adds contrast	aber
Das ist nicht mein Buch, ___ deins.	"Yours" directly replaces the negated "mine"	sondern

Step-by-Step Guide to Choosing the Right Conjunction

Adding information or listing? → Use und.
Offering an alternative or choice? → Use oder.
Giving a reason? → Use denn (keeps normal word order — easiest at beginner level).
Showing contrast between two true statements? → Use aber.
First clause is negative AND the second clause directly corrects it? → Use sondern.
When in doubt between sondern and aber: If you can add "rather" to the English translation and it sounds natural → sondern. Otherwise → aber.

Pro Tip: Sondern has a twin signal — it almost always appears directly after nicht or kein in the first clause. If you do not see a negation in the first clause, the answer is aber, not sondern.

Memory Pattern: Think of sondern as "swap" — it swaps the wrong thing for the right one. Think of aber as "nevertheless" — both things are true, but they pull in different directions.

Key Examples

German	English	Note
Ich lerne Deutsch und ich lese gern.	I am learning German and I like reading.	und — adding two independent activities
Er ist müde, aber er arbeitet weiter.	He is tired, but he keeps working.	aber — both statements true, in contrast
Möchtest du Kaffee oder Tee?	Would you like coffee or tea?	oder — two alternatives in a question
Ich bleibe zu Hause, denn ich bin krank.	I am staying home because I am ill.	denn — reason with normal word order; bin stays in position 2
Er ist nicht müde, sondern krank.	He is not tired, but rather ill.	sondern — corrects the negation; krank replaces müde
Das ist nicht mein Hund, sondern der Hund meiner Schwester.	That is not my dog, but my sister's dog.	sondern — replaces the false possessive with the correct one
Sie spricht Deutsch, aber ihr Akzent ist stark.	She speaks German, but her accent is strong.	aber — both clauses positive, in mild contrast
Ich kaufe Brot, Butter und Käse.	I am buying bread, butter and cheese.	und — listing items in a series
Wir gehen ins Kino, denn der Film ist sehr gut.	We are going to the cinema because the film is very good.	denn — reason, verb bleibt in position 2 after denn
Er trinkt nicht Kaffee, sondern Tee.	He does not drink coffee, but tea.	sondern — Tee directly replaces the negated Kaffee

Common Mistakes

Mistake 1: Er ist nicht müde, aber krank.
- Fix: After a negation where the second clause directly corrects the first, use sondern, not aber: Er ist nicht müde, sondern krank. Aber would imply both things are partially true — sondern says the first idea is wrong and the second replaces it.
Mistake 2: Ich lerne Deutsch, sondern es ist schwer.
- Fix: Sondern requires a negation in the first clause. There is no negation here, so use aber: Ich lerne Deutsch, aber es ist schwer.
Mistake 3: Ich bleibe zu Hause, denn ich krank bin.
- Fix: After denn, word order stays normal — the verb goes to position 2, not the end: Ich bleibe zu Hause, denn ich bin krank. This is a common error caused by confusing denn with weil.
Mistake 4: Das Buch ist interessant und aber es ist lang.
- Fix: Never combine two coordinating conjunctions together. Choose one: Das Buch ist interessant, aber es ist lang.
Nuance 1: Dropping the subject after und when subjects differ.
- Fix: You can only drop the subject in the second clause after und when both subjects are the same: Er kauft Brot und geht nach Hause (he does both). If the subjects differ, both must be stated: Er kauft Brot und sie kocht das Essen.

Cultural Insights

denn in spoken German: Denn as a coordinating conjunction (meaning "because") is very natural in everyday spoken German and casual writing. It is slightly more informal than weil and is preferred when the speaker wants to explain something in a flowing, conversational way. You will hear it constantly in German podcasts, conversations, and TV programmes.
sondern gar nicht vs. sondern auch: Two fixed expressions build on sondern. Nicht nur... sondern auch (not only... but also) is one of the most elegant connectors in German and is used at every level from B1 upward. Nicht nur er, sondern auch sie spricht Deutsch. Learning sondern well now unlocks this structure later.

Practice Scenarios

Describing yourself: Connecting facts about your life, e.g., Ich lerne Deutsch und ich wohne in Berlin. (I am learning German and I live in Berlin.)
- Ich lerne... und ich... (I... and I...)
- Ich mag..., aber ich mag... nicht. (I like..., but I don't like...)
- Ich spreche Englisch, aber mein Deutsch ist noch nicht perfekt. (My German is not perfect yet.)
Making choices: Expressing alternatives and decisions, e.g., Fahren wir mit dem Bus oder nehmen wir ein Taxi? (Do we take the bus or get a taxi?)
- Möchtest du... oder...? (Would you like... or...?)
- Wir können... oder wir können... (We can... or we can...)
Giving reasons: Explaining why, e.g., Ich lerne jeden Tag, denn die Prüfung ist nächste Woche. (I study every day because the exam is next week.)
- Ich... , denn... (I..., because...)
- Er bleibt zu Hause, denn... (He is staying home because...)
Correcting misunderstandings: Using sondern to set the record straight, e.g., Das ist nicht falsch, sondern nur unvollständig. (That is not wrong, but rather just incomplete.)
- Das ist nicht..., sondern... (That is not..., but rather...)
- Ich bin nicht müde, sondern hungrig. (I am not tired, but hungry.)

Follow-Up Questions

When do you use sondern instead of aber?
- Example Answer: Use sondern only when the first clause contains a negation (nicht or kein) and the second clause directly corrects or replaces the negated idea. Er ist nicht Lehrer, sondern Arzt. If there is no negation, or the second clause just adds a contrasting fact rather than replacing the first, use aber.
Why does denn keep normal word order but weil does not?
- Example Answer: Denn is a coordinating conjunction — it connects two independent main clauses and does not affect word order. Weil is a subordinating conjunction — it introduces a dependent clause where the verb must go to the end. Both mean "because" but they belong to different grammatical categories.
Can you start a sentence with aber in German?
- Example Answer: Yes — aber can begin a sentence for emphasis, just as "but" can in English. Aber das stimmt nicht! (But that is not right!) This is perfectly correct in both formal and informal German.

Conclusion

The five coordinating conjunctions — und, aber, oder, denn, sondern — are the most essential linking tools in German. They all keep normal word order in the clause that follows them, making them straightforward to use from the very beginning. The one distinction that requires attention is sondern vs. aber — but once you remember that sondern always follows a negation and replaces the negated idea, the choice becomes automatic. With these five words, you can connect ideas, explain reasoning, express contrast, and correct misunderstandings in any conversation.

Practice Makes Perfect

The exercises below focus especially on the sondern vs. aber distinction and on keeping correct word order after denn — the two points where learners most commonly make errors.