Past Perfect Progressive
The past perfect progressive emphasizes the duration or course of an action taking place before a certain period of time in the past.

Present perfect progressive is also known as present perfect continuous.



                  Form 
Form of Past Perfect Progressive


Use of past perfect Progressive
  • Action taking place before a certain period of time in the past.
  • Sometimes present perfect progressive can be changed with past perfect simple.
  • Emphasizes the duration or the course of an action.



Signal Words
  • For
  • Since
  • The whole day
  • All day