Past Perfect
Continuous

Form — had been + -ing

	example
positive	I had been watching them. · She had been learning the language.
negative	I hadn't been watching them. · They hadn't been working hard.
question	Had you been watching them? · Which language had she been learning?

Use — an action in progress before another past point

Use the past perfect continuous to talk about an action that was happening in the past before another past action or time:

I had been learning French for five years when I went to live in Paris.

The first action can stop when the second one happens, or continue:

• We'd been waiting for forty minutes when the bus finally arrived. (stopped)
• Julia had been working there for two years when Phil became the new manager. (continued)

Emphasising time and giving reasons

Often emphasises a period of time: Pizarro had been exploring for twenty years when he went to Peru.

Often gives a reason for a past state or feeling: Derek was very tired when he arrived — he'd been driving in heavy traffic all afternoon.

Past continuous vs past perfect continuous

structure	meaning	example
past continuous	still in progress at that past moment	When I arrived, Brad was washing the car. (still washing)
past perfect continuous	had stopped, evidence remains	When I arrived, Brad had been washing the car and he was wet. (no longer washing)

Past perfect simple vs past perfect continuous

structure	meaning	example
past perfect simple	action finished; focus on result/number	I called after I'd written my essay. (finished)
past perfect continuous	duration; may not be finished	I called after I'd been writing for two hours.

With a number or amount, use past perfect simple, not continuous:
✅ I gave up after I'd phoned six times. ❌ had been phoning six times
✅ I called after I'd read half the reports. ❌ had been reading half the reports

State verbs

State verbs (know, like, want, believe, understand, see, hear, agree) are normally not used in the continuous, including the past perfect continuous:

✅ I had known her for years. — ❌ I had been knowing her for years.

Common mistakes

❌	✅
I'd been phoning six times.	I'd phoned six times. (number → simple)
She had been knowing him for years.	She had known him for years.
He was tired because he drove all day.	He was tired because he'd been driving all day.
When I arrived, Brad was washing the car and he was wet.	When I arrived, Brad had been washing the car and he was wet.