2. Accusative or Dative
The prepositions require dative or accusative, depending on the context.
answers the question: Where is something/someone? Wo ist jemand/etwas?
answers the question: where to (wohin) is something/someone going, running, etc. You always have two places: A and B. The movement goes from A to B. (for example from the street into the restaurant, from the restaurant to the bar etc.)
|In some grammar books, you find the difference between movement (Dative) – no movement (Accusative).
This is wrong. If you have learned it, try to figure out the correct concept. Otherwise, you might get confused!
You can have a lot of movement at one place (where): Where do you run/swim/go for a walk?
I am swimming in a pool. This is definitely a movement, isn’t to? But it is a movement at one place, the pool. For a clearer understanding, have a look at the example sentences and the video.
However, with accusative, you always have a movement.
With dative, it is no movement and sometimes also movement!