Ich bin an, nein in, nein warte... beim Frisör.
Ever felt frustrated for not knowing which preposition to use when talking about places? No worries, we have done our research and we are going to show you a couple of tips and tricks!
1. Inside a place that usually has four walls and a roof ⇒ IN
Im Park, im Garten (no walls)
Zu Hause (with walls)
In der Küche (even if it is an open kitchen, because open kitchens are a relatively new concept ;))
2. At the entrance, next to, or touching sidewards ⇒ AN
at the entrance, near the station or at the platform
Note here: im Flughafen is grammatically correct if you are inside the airport building, but it is not very common to say that, more common is to say am Flughafen. Same with am Bahnhof.
3. At an outdoor place or open area ⇒ AUF
at the party (indoor or outdoor parties)
4. At someone's place ⇒ BEI
(even if it's a doctor's office or a hairdresser)
at the baker's (in the bakery)
Did you notice that in all these cases we use the dative? Because we're saying WHERE we are.