Breakdown of Das Öffnen der Tür macht Lärm.
Questions & Answers about Das Öffnen der Tür macht Lärm.
Öffnen is capitalized because here it is being used as a noun, not as a normal verb.
- As a verb: Ich öffne die Tür. – I open the door. (lowercase)
- As a noun (a “nominalized infinitive”): Das Öffnen der Tür – the opening of the door (capitalized)
German often turns infinitive verbs (öffnen, lernen, essen, etc.) into nouns by:
- Capitalizing them, and
- Usually putting das in front (because these noun-forms are always neuter).
So das Öffnen literally means “the opening” (the act of opening).