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du klopfst

knock

→ klopfen
klopf knock, tap + st you (singular) present
verb · 2nd-person singular, present tense Rare #47,112
knock Used here with an: to knock on a door or window.
GE: Klopfst du an die Tür?
EN: Are you knocking on the door?
Conjugation of klopfen
Indicative present
SingularPlural
First klopfe klopfen
Second klopfst klopft
Third klopft klopfen

Klopfst du an das Fenster?

Are you knocking on the window?

Mittags kommst du und klopfst an die Tür.

You come at noon and knock on the door.

— Die Taschendiebin (2016)

Klopfst du dann an mein Fenster?

Will you knock on my window then?

— Der Hochstapler - Roofman (2025)

Warum klopfst du nicht an?

Why don't you knock?

— Audition (2000)