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
has studied
will be studying
will have been studying
would be studying
She _____ how to swim by next summer.
will be learning
has learnt
is learning
will have learnt
He _____ every morning since September in preparation for the marathon
is running
runs
gone running
has been running
She _______ such a beautiful sunset before in her life
not saw
not been seeing
had never seen
's not seen
They_________ soccer when it started raining
have been playing
played
was playing
were playing
He_____ on the phone right now
talked
is talking
talks
be talking
They ____ their relatives next month
were visiting
would visit
be visiting
will visit
I _________ for hours when the bus finally arrived.
was waiting
waited
had been waiting
be waiting
