By the time we ___ , they had already left.
were arriving
arrived
arrive
had been arriving
I ____ New York several times.
was in
visit
been in
have visited
She _______ medicine for nearly a decade when she finally becomes a doctor
will have been studying
will be studying
has studied
would be studying
She _____ how to swim by next summer.
has learnt
will be learning
will have learnt
is learning
He _____ every morning since September in preparation for the marathon
is running
has been running
gone running
runs
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
were playing
was playing
played
have been playing
He_____ on the phone right now
talked
be talking
is talking
talks
They ____ their relatives next month
were visiting
would visit
be visiting
will visit
I _________ for hours when the bus finally arrived.
be waiting
had been waiting
waited
was waiting
