1.Why these four words matter
With short individual sentences, you can communicate basic facts:
Conjunctions let you connect those facts or show a different relationship between them:
This makes communication longer, clearer, and more natural. At A2 it is especially important to distinguish the meaning of each conjunction, keep word order correct after it, not confuse denn with weil, and use commas correctly.
| Conjunction | Meaning |
|---|---|
und | addition |
oder | alternative |
aber | contrast / limitation |
denn | reason |
2.What is a conjunction?
A conjunction connects linguistic units: words, phrases, or complete clauses.
und, oder, aber, and denn are coordinating conjunctions: they connect elements at the same level.
3.The most important word-order rule
After und, oder, aber, and denn, normal German main-clause word order remains. The finite verb still occupies position 2. The conjunction itself does not count as a sentence position.
In the second clause, ich is position 1 and arbeite is position 2.
4.The conjunction does not occupy position 1
Compare separate sentences with the version using aber:
After aber, a normal main clause begins: aber + ich + gehe. Incorrect: aber gehe ich — that would look as if aber took position 1. The same rule applies after und, oder, and denn.
5.Overview
| Conjunction | Function | Example |
|---|---|---|
und | adds information | Ich koche und er deckt den Tisch. |
oder | gives an alternative | Fährst du mit dem Bus oder nimmst du die Bahn? |
aber | shows contrast | Es ist teuer, aber sehr gut. |
denn | gives a reason | Ich gehe nach Hause, denn ich bin müde. |
None of these four changes normal main-clause word order.
6.und: adding information
und connects information that belongs together. The second piece simply adds to the first.
7.und between words
und can connect items of the same type. More than two elements are also possible — then und comes before the last item.
8.und between phrases
und can also connect larger units with the same grammatical function. A complete second sentence does not always need to be repeated.
9.und between two main clauses
Both parts can be complete main clauses. Each has its own verb position; after und, the verb stays in position 2.
This corresponds to: Ich koche heute. and Mein Freund macht den Abwasch.
10.Shared elements can be omitted
If the subject is the same, German often does not repeat it. The shorter form is natural when both actions share one subject.
This means: Ich komme nach Hause. and Ich mache sofort das Fenster auf.
11.oder: expressing an alternative
oder presents a choice or alternative. The two possibilities stand as options.
12.oder in questions
oder is especially common in questions. The answer normally chooses one of the options.
13.oder can connect full clauses
The second clause still uses normal main-clause word order.
14.und or oder?
With und, both products are bought; with oder, an alternative is presented.
| Conjunction | Relationship |
|---|---|
und | A + B |
oder | A / B |
15.aber: showing contrast
aber connects information that contrasts with or limits what came before. The second part creates a contrast or restriction.
16.aber between words and phrases
You do not always need two complete clauses:
There is also a different structure: nicht Montag, sondern Dienstag. This uses sondern, not aber. sondern has its own meaning and belongs to a separate topic.
17.aber between main clauses
Very often, aber connects two complete main clauses. After aber, a normal main clause begins again.
18.aber and trotzdem are not the same
aber is a conjunction. trotzdem is an adverb and can occupy position 1, so the verb follows directly.
That is why the word order looks different: after aber you get wir gehen, after Trotzdem you get gehen wir immediately.
19.denn: giving a reason
denn roughly means “because” / “for the reason that …”. It connects two main clauses, and the second clause gives a reason that explains the first.
20.denn answers the question why?
The information after denn is the reason.
Here the reason is ich bin müde.
21.Word order after denn
denn connects two main clauses, so the verb in the second clause stays in position 2: denn + ich + bin + krank. The order denn ich krank bin is subordinate-clause word order, as with weil.
22.denn and weil: same function, different grammar
Both can express a reason. This contrast is particularly important at A2.
| Conjunction | Word order |
|---|---|
denn | main-clause word order |
weil | verb at the end of the subordinate clause |
23.denn often sounds explanatory
denn is often used when a statement is followed by an explanation or justification. The first part is the main statement; the second gives the explanation.
24.Four conjunctions, four relationships
Compare the same basic information with different conjunctions.
| Conjunction | Relationship |
|---|---|
und | addition |
oder | alternative |
aber | contrast |
denn | reason |
25.Comma before und
Between two main clauses with und, German normally uses no comma. A comma can appear between longer independent clauses for clarity, but at A2 it is usually unnecessary. In a simple list, there is normally no comma before the final und either.
26.Comma before oder
Before oder, German also normally uses no comma.
Normally no comma before
undoroder.
27.Comma before aber
Before aber, a comma is normally used. For A2, ..., aber ... is a very useful pattern.
28.Comma before denn
When denn connects two main clauses, a comma comes before it: main clause, denn main clause.
29.Comma overview
| Conjunction | Typical A2 comma rule |
|---|---|
und | normally no comma |
oder | normally no comma |
aber | comma |
denn | comma |
Long and complex sentences allow additional punctuation choices, but this basic orientation is enough for A2.
30.Negation with und
und can also connect negative statements. Each negative word belongs to the part it negates.
31.Negation with oder
In negative contexts, oder can connect alternatives. In clear everyday German, weder ... noch is often easier — it is a separate structure and does not have to be replaced by oder.
32.aber after a negative statement
aber is common when something positive or contrasting follows negative information. The contrast is especially clear here.
33.denn after a negative statement
A negative statement can also be explained. The first clause contains the negation; the second gives the reason.
34.Shared subjects: you do not always repeat everything
With und, oder, and aber, a shared subject can sometimes be stated only once.
With aber, the full form with a repeated subject is usually especially clear and natural for learners:
If the sentence is made more compact, German often prefers another structure: Er ist müde, arbeitet aber noch weiter. At A2, the pattern aber + subject + verb is particularly transparent.
35.denn normally introduces a complete clause
After denn, a complete reason is normally given. denn connects two complete main clauses, not a fragment like denn kaputt.
36.Several conjunctions in a longer sentence
Even at A2, one sentence can contain more than one relationship. These longer sentences remain clear when each connector has one clear function.
Here aber marks contrast and denn marks reason.
37.Connect ideas logically
Not every grammatically possible connector is logical. The choice of conjunction depends on meaning, not grammar alone.
In the first case, little sleep is a reason for tiredness. In the second, tiredness and going to the gym form a contrast.
38.Common mistakes
Putting the verb in the wrong place
| Incorrect | Correct |
|---|---|
Ich bin müde, aber ich weiter arbeite. | Ich bin müde, aber ich arbeite weiter. |
After und, oder, aber, and denn, normal main-clause word order remains.
Treating denn like weil
| Incorrect | Correct |
|---|---|
Ich bleibe zu Hause, denn ich krank bin. | Ich bleibe zu Hause, denn ich bin krank. |
With weil: Ich bleibe zu Hause, weil ich krank bin.
Using aber when there is no contrast
If both products are simply intended, aber does not fit — it needs a real contrast or limitation.
| Incorrect | Correct |
|---|---|
Ich kaufe Brot, aber Milch. | Ich kaufe Brot und Milch. |
Confusing und and oder
| Sentence | Meaning |
|---|---|
| Möchtest du Kaffee und Tee? | both drinks are possible |
| Möchtest du Kaffee oder Tee? | a choice |
In offers and questions, this difference can strongly change the meaning.
Forgetting the comma
| Incorrect | Correct |
|---|---|
Ich komme gern aber ich habe keine Zeit. | Ich komme gern, aber ich habe keine Zeit. |
Ich fahre nach Hause denn ich bin müde. | Ich fahre nach Hause, denn ich bin müde. |
39.A compact decision path
When you want to connect two ideas, ask:
- Is the second idea simply additional information? →
und - Are there two possibilities? →
oder - Is there a contrast or limitation? →
aber - Does the second idea explain a reason? →
denn
Then keep normal main-clause word order.
40.A small meaning formula
| Construction | Relationship |
|---|---|
A und B | A + B |
A oder B | A / B |
A, aber B | A ↔ contrast ↔ B |
A, denn B | A ← reason: B |
These four relationships cover a large part of simple everyday sentence connections.
41.Combining conjunctions with time expressions
Conjunctions work normally with time expressions. A time expression can occupy position 1 in the second main clause.
After the conjunction: morgen + habe, morgen + wird.
42.Something else can occupy position 1 in the second clause
A pronoun does not always have to follow the conjunction. The normal V2 rule still applies: whatever is in position 1, then the verb in position 2.
After aber: morgen = position 1, habe = position 2.
43.und, oder, aber, denn in everyday communication
Typical everyday functions: und adds information, oder offers options, aber expresses problems, limitations, or contrasts, and denn gives reasons for decisions or situations.