We normally use HAVE/HAS BEEN in the Present Perfect Continuous Tense. HAS BEEN is used if the subject is third person singular (he/she/it) and HAVE BEEN is used for all other persons (I/you/we/they).
The Present Perfect Continuous refers to an action that started in the past and is still continuing in the present.
Maria has been studying for her exam since 8 o’clock. (and she still is)
We have been running for an hour. (and we still are)
How long have you been living in Chester?
HAVE/HAS BEEN is also used as a form of “to be” in Present Perfect Simple / Continuous passive constructions.
They have been robbed.
She has been named after her grandma.
The toys have been being tidied up by the children all morning.