Ich schnalle den Sicherheitsgurt ab, bevor ich aus dem Auto steige.

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Questions & Answers about Ich schnalle den Sicherheitsgurt ab, bevor ich aus dem Auto steige.

What does abschnallen mean, and why does the prefix ab appear at the end of the clause?
The verb in the main clause is the separable verb abschnallen (“to unfasten/unclip”). In present-tense main clauses, the prefix ab detaches and moves to the end. Hence Ich schnalle den Sicherheitsgurt ab literally “I un-clip the seat belt.”
Why is den Sicherheitsgurt in the accusative case?
Sicherheitsgurt is the direct object of the transitive verb abschnallen, so it takes the accusative. Since “Gurt” is masculine (der Gurt), its accusative article is den.
What is der Sicherheitsgurt in English?
Literally, Sicherheitsgurt means “safety belt.” The usual English term is seat belt.
Why is there a comma before bevor?
Bevor is a subordinating conjunction (“before”). German grammar requires a comma before any subordinate clause introduced by such conjunctions.
Why does steige come at the end of the clause bevor ich aus dem Auto steige, and what happens to the prefix aus?
Subordinate clauses in German have verb-final word order. For separable verbs like aussteigen (“to get out”), the verb stem steige goes to the very end, and its prefix aus immediately follows it, yielding … aus dem Auto steige.
Why is it aus dem Auto rather than aus das Auto?
The preposition aus always governs the dative case. “Auto” is neuter (das Auto), so in the dative it becomes dem Auto.
Why is the subject ich repeated in the subordinate clause?
In German, each clause needs its own explicit subject (unless it’s an infinitive or participial clause). So you repeat ich in bevor ich aus dem Auto steige.
Can I put the subordinate clause first, and if so, what changes?

Yes. You can write:
Bevor ich aus dem Auto steige, schnalle ich den Sicherheitsgurt ab.
The comma stays, and because the subordinate clause comes first, the main clause still follows the verb-second rule—schnalle comes immediately after ich.

What is the difference between bevor and nachdem?
Bevor (“before”) introduces an action that happens first. Nachdem (“after”) introduces an action that follows and usually requires the perfect or pluperfect in the subordinate clause for past sequences (e.g. Nachdem ich den Gurt abgeschnallt hatte, stieg ich aus).
Why is the present tense used for both actions instead of a past or perfect form?
German frequently uses the present tense to describe sequences of actions, especially with temporal conjunctions like bevor. It’s a simple way to state that one action immediately follows another.