By the time we ___ , they had already left.
had been arriving
arrive
arrived
were arriving
I ____ New York several times.
visit
been in
have visited
was in
She _______ medicine for nearly a decade when she finally becomes a doctor
will be studying
would be studying
will have been studying
has studied
She _____ how to swim by next summer.
is learning
will have learnt
will be learning
has learnt
He _____ every morning since September in preparation for the marathon
runs
is running
has been running
gone running
She _______ such a beautiful sunset before in her life
's not seen
not saw
had never seen
not been seeing
They_________ soccer when it started raining
played
have been playing
were playing
was playing
He_____ on the phone right now
talked
talks
is talking
be talking
They ____ their relatives next month
were visiting
will visit
would visit
be visiting
I _________ for hours when the bus finally arrived.
had been waiting
waited
be waiting
was waiting
