Past perfect
I _____________ that you knew him (forget)
I had forgotten that you knew him
I _________ for two days. (Travel)
She __________her room for a month (not leave)
She hadn't left her room for a month
The man _________ to the end of the seat. (Hold)
Had been holding
It was worse than he __________ (expect)
It was worse than he had expected
Stacy´s dog ________ since the cat next door died. (not bark)
hadn´t been barking
I ___________ him for years (not see)
I hadn't seen him for years
He __________ some issues while he was doing his final exams. (Have)
had been having
__________ him about his business? (she/send/?)
Had she sent him about his business?