Someting we should or shouldn't do and can or can't do

In Library :

You aren't supposed to noisy in library

You are supposed to read book in library

You are allowed to borrow book in library

You aren't allowed to bring food to library

In Train :

You are expected to give your sit to expectant mother

You aren't to sit on folding chair 

You are allowed to talk with your friends

you aren't allowed to bring your pet

In Museum :

You are supposed to learn history in museum

You aren't supposed to  touch fossil

You are allowed to take a picture of fossil

You aren't allowed to wreck fossil

In Restaurant :

You are allowed to ask menu to waitress

You aren't allowed to smoke in restaurant

You are supposed to eat in rastaurant

You aren't supposed to leave without pay the bill

In Classroom : 

You are supposed to bring note to class

You aren't supposed to play your phone when lecture is teaching

You are allowed to ask your lecture if you still not understand

You aren't allowed to ask your friends during exam