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