Odpowiedź:
is going to rain
saw
didn't hear
were sailing
found
didn't sleep
watched (?)
Diana used to drink a lot of coffee.
Did you use to read a lot?
I used to play football.
Did Tom use to play piano?
Bill didn't use to ride a horse.
was riding
were having
was driving
were visiting
was sleeping
She wasn't waiting for a train.
Were you buying a bus ticket?
They weren't staying at a hotel.
I wasn't flying to LA.
Was he taking any photos?
when
while (w zależności od kontekstu pasowałoby też when, ale załóżmy tak)
while
when
