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'Been' is used to express importance given to the duration of the action."
'Been' is the past participle of the verb 'be'. It is always used in along with auxiliary verbs like have, had, has, etc. It is used in Perfect Continuous Tense, Present / Past / Future Perfect Continuous Tense.
"Auxiliary-cum-verbs" are :
These 11 auxiliaries are also used as verbs, therefore, they are called Auxiliary–cum–verbs.
These are used to form Tenses. ( Please refer Tense Table).
"Pure Auxiliary verbs" are :
These 20 auxiliaries only support normal verbs, therefore, they are called Pure Auxiliary Verbs. They are also called Models or Model Auxiliary Verbs.