Introduction to Formal and Informal Writing in Italian Part 2

Even if this is not a rule written in a grammar book (not yet, at least!), it can be said that you should use:
– formal language when you write a letter or an email to someone you have never met;
– informal language when you write an email, a text message or a message in a chat to someone with whom you are in confidence;
– a mixture of formal and informal language when you write a text message or a message in a chat to someone with whom you are not in confidence.