perché

In a sentence

• Perché vuoi imparare l'italiano?

  Why do you want to learn Italian?

  Here, "perché" is used as an interrogative adverb to ask for the reason or purpose of an action.

• Non sono andata al cinema perché ero stanca.

  I didn't go to the cinema because I was tired.

  In this example, "perché" serves as a conjunction introducing a causal subordinate clause explaining the reason for the main clause.

• Non capivo il motivo del suo comportamento perché era silenzioso.

  I didn't understand the reason for his behavior because he was silent.

  The word "perché" is used as a causative conjunction specifying the reason behind the situation described in the main clause.