Merkhilfe
ATgenaue Uhrzeit, Feiertage, Nacht: at 8 p.m. · at Christmas · at night · at the weekend
ONTage & Daten: on Monday · on my birthday · on the 12th of July · on Tuesday evening
INlÀngere ZeitrÀume: in December · in 1980 · in spring · in the morning/evening