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We use the Past Perfect Continuous to describe an ongoing or continuous action that started in the past and continued up to a certain point in the past.
This tense emphasizes the duration or continuity of an action that occurred before another action or event in the past.
Form: had been + V+ing
For example:
"She had been studying for two hours before the exam started."
This sentence indicates that the action of studying (past perfect continuous) started before the exam started and continued for a period of two hours leading up to that point.
Signal words: "before", "after", "for", "since", "all day", "all morning" etc.
The Past Perfect Simple is used to describe an action completed before another action or event in the past, while the Past Perfect Continuous is used to describe an ongoing or continuous action that occurred before another action or event in the past.
