Prepositions with at

at the bus stop
at the traffic light
at her desk

There's somebody at the bus stop / at the door.
The car is waiting at the traffic light.
Julia is working at ther desk.

at work                                                                     Where's Kate?   She's at work.
at the station / at the airport                                       Do you want me to meet you at the airport?
at the post office  at supermarket                                I sar your brother at the post office today.
at Tracy's (house) / at the doctor's (office)                   Where were you Friday?   At my sister's.
at the hairdresser's, etc.                                              I saw Tom at the doctor's.
at a concert / at a party / at a footbal game, etc.          There weren't many people at the party.


at the window
at the intersection
at the church.

Who is that man standing at the window ?
Turn left at the intersection / at the church. ?