In hospital / at work etc.
We say that somebody is
in hospital / in prison / in jail:
- Anna's mother is in hospital.
We say that somebody is
at work / at school / at university / at college:
- I'll be at work until 5.30.
- Julia is studying chemistry at university.
We say that somebody
is at home or
is home (with or without
at), but we say
do something at home (with
at):
- I'll be at home all evening. or I'll be home all evening.
- Shall we go to a restaurant or eat at home?
At a party / at a concert etc.
We say that somebody is
at an event (
at a party / at a conference etc.):
- Were there many people at the party / at the meeting / at the wedding?
- I saw Steve at a conference / at a concert on Saturday.
In and at for buildings
You can often use
in or
at with buildings. For example, you can eat
in a restaurant or
at a restaurant; you can buy something
in a supermarket or
at a supermarket. We usually say
at when we say where an event takes place (for example: a concert, a film, a party, a meeting):
- We went to a concert at the National Concert Hall.
- The meeting took place at the company's head office in Frankfurt.
- There was a robbery at the supermarket.
We say
at the station /
at the airport:
- There's no need to meet me at the station. I can get a taxi.
We say
at somebody's house:
- I was at Helen's house last night. or I was at Helen's last night.
Also at the doctor's / at the hairdresser's etc.
We use
in when we are thinking about the building itself. Compare:
- We had dinner at the hotel.
All the rooms in the hotel have air conditioning. (not at the hotel) - I was at Helen's (house) last night.
It's always cold in Helen's house. The heating doesn't work well. (not at Helen's house)
In and at for towns etc.
We normally use
in with cities, towns and villages:
- The Louvre is a famous art museum in Paris. (not at Paris)
- Sam's parents live in a village in the south of France. (not at a village)
We use
at when we think of the place as a point or station on a journey:
- Does this train stop at Oxford? (= at Oxford station)