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