Ich muss mein Projekt bis zum Freitag abschließen.

Pronunciation: Ikh mus mine Projekt bis tsum FRY-tahg AHP-shlees-en.

Meaning: I need to complete my project by Friday.

This phrase is essential for discussing workplace deadlines in German; note that "abschließen" literally means "to close" but is commonly used to mean "complete" or "finish" in a business context.