can you describe when to use "have been" and "had been"
The following explanation is taken from Verb Tenses
Present Perfect Progressive
Present perfect progressive tense describes an action that began in the past, continues in the present, and may continue into the future. This tense is formed by using has/have been and the present participle of the verb (the verb form ending in -ing).The CEO has been considering a transfer to the state of Texas where profits would be larger.Past Perfect Progressive
Past perfect progressive tense describes a past, ongoing action that was completed before some other past action. This tense is formed by using had been and the present perfect of the verb (the verb form ending in -ing).
See usage here:Before the budget cuts, the students had been participating in many extracurricular activities.
Present Perfect Progressive (Present Perfect Continuous)
Past Perfect Progressive (Past Perfect Continuous)
Does that help?