English Grammar Reference: The Past Perfect Continuous
We use the past perfect continuous when there are 2 actions in the past. The first action lasted a long time and we use the past perfect continuous to describe it. The action stops when the second action takes place. For the second action we use the past simple.
I had been living in Italy for 3 years before I went to Rome.
I'd been watching television for half an hour when I fell asleep.
Look at the construction:
-ing form of verb
for 2 hours when the phone rang.
for an hour before she arrived.
Look at the question form:
when they woke you up ?
I'd been sleeping for 2 hours.
been going out together
before you decided to get married?
We'd been going out together for 6 months.
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