Breakdown of Jemand klopft an die Tür, aber niemand ist da.
sein
to be
aber
but
an
at, on (vertical) / to (addressee) / of (in quantity/stock expressions)
die Tür
the door
da
there
jemand
someone
klopfen
to knock
niemand
no one
Questions & Answers about Jemand klopft an die Tür, aber niemand ist da.
Why don't jemand and niemand have any endings here?
In this sentence, they are both the subject of their respective clauses, which means they are in the nominative case. Jemand (someone) and niemand (no one) take endings in the accusative (jemanden and niemanden) and dative (jemandem and niemandem), but the base forms are used for the nominative.
How do I know which verb ending to use with jemand and niemand?
Indefinite pronouns like jemand and niemand always take the third-person singular verb conjugation. You treat them exactly like er, sie, or es. That is why the verbs here are klopft and ist.
Why does the sentence use the accusative an die Tür instead of the dative an der Tür?
The word an is a two-way preposition. It takes the accusative case when there is an action directed towards a target. The knocking is directed at the door, so we use the accusative die Tür. If you were describing a static location, like a sign already hanging on the door, you would use the dative (an der Tür).
What exactly does da mean at the end of the sentence?
While da translates directly to 'there', the combination da sein is a very common phrase meaning 'to be present' or 'to be around'. So niemand ist da simply means 'no one is there' or 'nobody is around'.
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