Present perfect -> has/have + [past participle]
Present perfect continuous -> has/have + [been] + [verb] + [ing]
Now which tense does has/have been + [verb] + [ed] refer to.
E.g. The chair has been shifted... <- Which tense is this?
"has been" is present perfect tense.
Here's the definition of presetn perfect tense. ( CP from websters)
The PRESENT PERFECT TENSE is formed with a present tense form of "to have" plus the past participle of the verb (which can be either regular or irregular in form). This tense indicates
either that an action was completed (finished or "perfected
") at some point in the past or
that the action extends to the present
So in your case, chair has been shifted
is an example where an action has been completed.
I have walked two miles already [but I'm still walking].
I have run the Boston Marathon [but that was some time ago].
The critics have praised the film Saving Private Ryan since it came out [and they continue to do so].
I'm crossing the bridge.........