While I _________ (walk) to school, I saw an old friend.
was walking
had walked
walked
had been walking
By the time we arrived, the movie _________ (start).
had started
started
had been starting
was starting
She _________ (already/eat) dinner before we invited her.
had already been eating
had already eaten
already ate
was already eating
He fell asleep while he _________ (watch) TV.
had watched
watched
had been watching
was watching
They _________ (never/be) to Paris before their honeymoon.
were never
had never been going
had never been
never were
I _________ (finish) my homework before my mom got home.
had finished
was finishing
had been finishing
finished
When he entered the room, everyone _________ (talk).
had been talking
talked
was talking
had talked
We were very tired because we _________ (walk) all day.
were walking
walked
had walked
had been walking
I _________ (read) when my phone rang.
read
had read
was reading
had been reading
They _________ (leave) before we arrived.
had been leaving
were leaving
had left
left
We _________ (arrive) at the airport two hours ago.
had been arriving
arrived
had arrived
were arriving
She _________ (finish) her homework and then watched TV.
was finishing
had been finishing
finished
had finished
I _________ (lose) my keys yesterday and so I couldn't get into my house.
was losing
had lost
lost
had been losing
They _________ (buy) a new car last weekend.
were buying
had been buying
bought
had bought
The teacher _________ (explain) the lesson and gave us some exercises.
had been explaining
explained
had explained
was explaining
She _________ (wait) for an hour before the bus came.
waited
had been waiting
had waited
was waiting
