My question is about at/in.
Why can't I use "in school?" I was told that I need to use "at school."
It's very confuses to [STRIKE]write[/STRIKE] use and understand.
The use of prepositions is idiomatic. There is no specific rationale behind it.What is the [STRIKE]in/at[/STRIKE] difference between "in" and "at"?
I always [STRIKE]used[/STRIKE] get it wrong. Is "in school" [STRIKE]is[/STRIKE] wrong?