English.Web: Past Perfect Continuous Use

Past Perfect Continuous: Use
< Form

To emphasise the continuity of the action described at the time stated in the past:

When I left the company, I had been working for them for 10 years.
When the letter arrived, I had been waiting for it for two weeks.
How long had she been living there when she moved?

Past Perfect Continuous: Use < Form

Past Perfect Continuous: Use
< Form