Du bluffst, und ich setze aus.

No. Du is capitalized here simply because it is the first word of the sentence.

The informal pronoun is normally written du in the middle of a sentence. For example:

• du bluffst
• ich glaube, dass du bluffst

It is not formal. The formal you in German is Sie.

So:

• Du bluffst = informal, singular you
• Sie bluffen = formal you

Bluffst comes from the verb bluffen, which means to bluff.

It is conjugated for du:

• ich bluffe
• du bluffst
• er/sie/es blufft

So Du bluffst means you are bluffing or you bluff depending on context.

This is a fairly straightforward regular verb in German, even though it is a loanword.

Yes. It is a normal German verb, even though it originally comes from another language.

German often takes foreign words and uses them like regular German verbs. So bluffen behaves grammatically like a regular -en verb:

• bluffen
• ich bluffe
• du bluffst
• wir bluffen

It is common in contexts like card games, poker, or more generally when someone is pretending to be more confident, stronger, or more certain than they really are.

Because the verb here is aussetzen, not aussitzen and not sitzen.

In this sentence, aussetzen means something like to sit out, to skip a turn, or to pass, depending on the context.

The base verb is setzen, so the ich form is:

• ich setze

Then the separable prefix aus moves to the end in a main clause:

• ich setze aus

So even though English often says I sit out, German uses aussetzen here.

Because aussetzen is a separable verb.

In a main clause, German splits separable verbs into two parts:

• the conjugated verb goes into the normal verb position
• the prefix goes to the end of the clause

So:

• infinitive: aussetzen
• main clause: ich setze aus

This is a very common pattern in German:

• aufstehen → ich stehe auf
• einkaufen → wir kaufen ein
• aussetzen → ich setze aus

Because after und, you usually just start another normal main clause.

German main clauses normally have the conjugated verb in second position. So in the second clause:

• ich = first element
• setze = conjugated verb in second position
• aus = separable prefix at the end

That gives:

• ich setze aus

So the full sentence is really two coordinated main clauses:

• Du bluffst
• ich setze aus

joined by und.

Usually, no. In a short sentence like this, many people would simply write:

• Du bluffst und ich setze aus.

That is completely normal.

The comma in:

• Du bluffst, und ich setze aus.

is possible as an extra separator between two independent clauses. It can make the pause or structure a little clearer. But in everyday writing, especially with short coordinated clauses, the version without the comma is often more typical.

So the main thing to remember is:

• without comma = very common
• with comma = possible for clarity or emphasis

Not only. Aussetzen can have several meanings in German, depending on context.

Some common meanings are:

• to skip a turn / sit out / pass in a game or activity
• to suspend something
• to expose someone or something to something unpleasant
• for a machine or engine, to cut out or fail temporarily

In Du bluffst, und ich setze aus, the game-related meaning is the relevant one: I sit this one out, I skip, or I pass.

Yes, if you want the formal form of you.

Then the sentence would be:

• Sie bluffen, und ich setze aus.

Notice that the verb changes too:

• du bluffst
• Sie bluffen

So the difference is not just the pronoun; the verb form must match it.

In standard German, you normally do need the subject pronoun.

So you say:

• Du bluffst
• Ich setze aus

Unlike in some languages, German usually does not drop subject pronouns in ordinary sentences, because they help clearly identify who is doing the action.

So leaving them out here would sound incomplete or ungrammatical in standard German.