Been is a form of verb "to be " called the "Participle "
It will be used in the following cases :
- When using the verb to be in the present perfect tense ,* to have + verb in participle *
in this case verb to be ---- have been
-When using any verb in the present perfect continuous * to have+ been + verb+ing
have been doing or listening etc .
-When using verb "to be" in the past perfect * had + been*
-When using it in the past perfect continuous *had + been+verb+ing*
had been doing , etc