German Grammar Explained /

Prepositions: AM UM IN

We have been learning about prepositions of place in previous lessons. Depending on what is used to answer the questions:
they will be followed by the dative or accusative cases, respectively. But not all prepositions are that high-maintenance. :) This topic is about prepositions of time. We advise you to learn them in context and not to worry about the grammar.
Days of the week and times of the day
am Montag
am Dienstag
am Vormittag
am Nachmittag
am Morgen
but: in der Nacht
im Frühling
im Sommer
im Winter
im Herbst
um 19 Uhr
um 12 Uhr
um 8 Uhr
um Mitternacht
Prepositions often can't be literally translated into every language.
Therefore, always learn prepositions in combination with phrases like the ones above and avoid looking up their translations isolated from context.
Grammar-Spaß If you insist on knowing the grammar, here are a few fun facts:
1. Prepositions of time are used to answer the questions "when" or "for how long".
2. Unlike prepositions of place, they don't change the case. Each preposition of time is followed by one case only. For example, an and in (time) are always followed by the dative.
an + dem = am in + dem = im