Ich denke oft darüber nach, dass die Zeit schnell vergeht.

Breakdown of Ich denke oft darüber nach, dass die Zeit schnell vergeht.

ich
I
oft
often
schnell
fast, quickly
die Zeit
the time
dass
that
vergehen
to pass (time)
nachdenken
to think, to ponder

Questions & Answers about Ich denke oft darüber nach, dass die Zeit schnell vergeht.

Why do we need darüber in this sentence instead of just saying über?
The verb nachdenken (to reflect on) is always paired with the preposition über. However, you cannot put über directly in front of a dass-clause. Instead, German uses the placeholder darüber in the main clause to point forward to the idea coming next. It acts like a bridge, meaning roughly "about it" or "about the fact".
Why is the word nach sitting by itself right before the comma?
The main verb here is nachdenken, which is a separable verb. In a present tense main clause, the prefix nach breaks off and goes to the very end of that clause. The comma marks the boundary of the main clause, so nach stops right there before the dass-clause begins.
Is there a difference between nachdenken über and denken an?
Yes! While both can translate to "think about" in English, denken an refers to a brief thought or simply having something on your mind. nachdenken über means to deeply ponder, reflect, or contemplate. Since the passing of time is a deep topic, nachdenken über is the natural choice here.
Why does the verb vergeht come at the very end of the sentence?
The second part of the sentence is a subordinate clause introduced by dass (that). Words like dass are subordinating conjunctions, which means they always force the conjugated verb—in this case, vergeht—to the very end of their respective clause.

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