Past Perfect Continuous Active

I Способ образования, вспомогательный глагол

had + been Ving        HAD

+ I\you\he\she\it\we\they had been playing

-  I\you\he\she\it\we\they hadn`t been playing

? Had I\you\he\she\it\we\they been playing

II.  Слу­ча­и упо­треб­ле­ния

1.Действие, которое началось в прошлом и длилось определённый период времени до другого действия или момента в прошлом.

They had been looking for a house for six month before they  found one they liked

2. Действие, которое длилось определённый период времени в прошлом и имело видимый результат в прошлом

Last Friday Ron had to fly to New York. His flight was delayed. He was annoyed. He had been waiting at the airport for 3 hours.

III Указатели

for, since, how long, before, until