Ich muss einen Bericht bis Freitag fertigstellen.

Pronunciation: Ikh moos eye-nen beh-RIKHT bees FRY-tahg fer-TICK-shtel-en.

Meaning: I have to finish a report by Friday.

This phrase is essential in German workplaces for discussing deadlines and project timelines; Germans place high importance on punctuality and clear communication about completion dates.