You mustn't run in the library.
You mustn't eat and drink in the library.
You can ask the librarian questions.
You mustn't drop litter in the library.
You mustn't listen to loud music in the library.
You can speak quietly in the library.
You mustn't bring pets inside in the library.
You mustn't talk on the mobile phone in the library.
You can use a computer in the library.
You can send text messages in the library.