I have made up the sentence below.
(1a) When I was in university, I didn't make new friends.
My non-native English speaking friends think I should use "at", as shown below.
(1b) When I was at university, I didn't make new friends.
Which preposition is correct? Thank you for your help and time.
You are referring a past event. So, you should use at instead of in . Present event : I am in University.
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You are referring a past event. So, you should use at instead of in.
Present event : I am in U