The perfect progressive tense (also called the perfect continuous tense) is used to say that an event or action is, was, or will be continually occurring (progressive) but that it is, was, or will be completed at a later time, or that it relates to a later time (perfect). The perfect progressive has a present, a past, and a future, just like other verb tenses.
To form the perfect progressive, use the appropriate tense of the verb have with been and the progressive (-ing) tense of the main verb.
The past perfect progressive says that a continuous action started in the past and was completed before another event in the past.
The future perfect progressive tells us that a continuous action will be completed at, or relates to, a time in the future.
Perfect Continuous tenses indicate actions that started in the past and continue up to a certain point or into the future.
"Have been," "has been," "had been," and "will have been" are used in the Perfect Continuous tenses.
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Past Perfect Continuous
Form: [Subject] + had been + [present participle]
Exaple : Amy + had been + telling her secret to Elly just now.
Future Perfect Continuous
Form: [Subject] + will have been + [present participle]
Example : Amy + will have been + telling her secret to Elly asa soon as possib;e