I know all the rules about how to form the articulated prepositions in Italian, so I don't have to understand how to construct them, but rather I have a doubt on when to use the simple and when to use the articulated one:
- Vado a scuola.
- Vado all'università.
Why don't we say "alla scuola", but we use only the simple preposition? In what other cases does something like this happen?