IN

In a shop, a room, a bank, a car/taxi, a river

In the north/south (of)

In a city, a country, Moscow, Russia

In X hospital

In a photo/picture

AT

At X home/work/school/college/university

At a bus stop, a station, an airport

At Ann’s (place), my sister’s (place), the doctor’s

Events: at a party/a concert/a football match/a wedding

IN/AT

In/At a restaurant, a hotel

In/At the cinema, the theatre

ON

On the grass, the beach

On a horse

Transport: on a bus/a train/a plane/a ship (But: in a taxi)

sth: on the wall/a table

on the first/second floor