Anna zieht nach, doch ich decke die Karte auf.

Because nachziehen is a separable verb.

In a normal main clause, German usually puts:

• the conjugated verb in position 2
• the separable prefix at the end

So:

• infinitive: nachziehen
• main clause: Anna zieht nach

This is the same pattern as:

• Ich komme an. from ankommen
• Er steht auf. from aufstehen

For the same reason: aufdecken is also a separable verb.

So the full verb is:

• aufdecken = infinitive

But in a main clause it splits:

• ich decke die Karte auf

The conjugated part decke goes near the front, and the prefix auf goes to the end.

Compare:

• infinitive: aufdecken
• main clause: Ich decke die Karte auf.
• with a modal: Ich will die Karte aufdecken.
• in a subordinate clause: ..., weil ich die Karte aufdecke.

Here doch is a coordinating conjunction, similar to but.

That means it joins two main clauses, and the second clause keeps normal main-clause word order:

• Anna zieht nach, doch ich decke die Karte auf.

So in the second clause:

• ich = subject
• decke = conjugated verb in second position

This is like:

• Anna kommt, aber ich gehe.

Important: this is a different use of doch from the modal particle doch, which can appear inside a sentence and has a different function.

Die Karte is in the accusative case because it is the direct object of aufdecken.

You are revealing / turning over something — the thing affected by the action is the direct object.

In this sentence:

• ich = subject
• decke auf = verb
• die Karte = direct object, so accusative

With die, nominative feminine and accusative feminine look the same, so the form does not change:

• nominative: die Karte
• accusative: die Karte

It comes from ziehen, yes, but here you should think of the full verb nachziehen, not just the base verb by itself.

A separable prefix often changes the meaning a lot. So although ziehen can mean pull or move, nachziehen has its own meaning and should be learned as one vocabulary item.

That is a very common pattern in German:

• stehen ≠ aufstehen
• kommen ≠ ankommen
• decken ≠ aufdecken

So learners should avoid translating prefix verbs too literally from the base verb.

Because German often uses the present tense for actions happening now, in general, or in a vivid narration.

Here:

• zieht
• decke

are both present-tense forms.

German uses the present tense more broadly than English sometimes does, so even if English might choose a slightly different form depending on context, the German present is completely normal.

Often yes.

Both doch and aber can mean but. In many contexts, either would be possible:

• Anna zieht nach, aber ich decke die Karte auf.
• Anna zieht nach, doch ich decke die Karte auf.

The difference is usually one of style or nuance:

• aber is the most common everyday word for but
• doch can sound a bit more pointed, contrastive, or slightly more literary depending on context

So a learner should understand doch here as a normal contrasting connector.

The comma separates two independent clauses:

1. Anna zieht nach
2. doch ich decke die Karte auf

In German, a comma is commonly used before conjunctions like aber and doch when they connect full clauses.

So the comma helps show that these are two complete thoughts joined together.

Because German capitalizes:

• proper names like Anna
• all nouns like Karte

So:

• Anna is capitalized because it is a name
• Karte is capitalized because every noun in German is capitalized

This is one of the most noticeable spelling differences between German and English.

Because decke is the 1st person singular present-tense form of decken.

The present-tense pattern for decken is:

• ich decke
• du deckst
• er/sie/es deckt
• wir decken
• ihr deckt
• sie/Sie decken

When the full verb is separable, the ending still goes on the main verb part:

• ich decke ... auf

So decke matches the subject ich.