since oder for – Zeitpunkt oder Zeitraum
since = seit einem Zeitpunkt: since Monday, since 2019, since I was five.
for = seit einem Zeitraum (eine Dauer): for two hours, for three years, for a long time.
- I have lived here since 2015.
- I have lived here for ten years.
- She has been waiting for twenty minutes.
„seit“ heißt nicht automatisch since! Falsch: I live here since ten years. – richtig: I have lived here for ten years.