Example: Susan (to fall) fell asleep while she (to do) was doing her homework.
a) When I (to walk) to the office yesterday, I (to meet) John.
b) It (to start) to rain when we (to play) in the garden.
c) When we (to watch) TV last night, Susan (to ring) us
and (to tell) us she (to have) a party at the same time.
d) I (to want) to visit you last night, but you (not to be)
at home. What (you / to do) at about 8 pm?
e) He (to recognize) me, although I (to wear) sunglasses.
f) When the schoolgirl (to cross) the street, a bicycle (to hit) and
(to injure) her.
a) was walking, met
b) started, were playing
c) were watching, rang, told, was having
d) wanted, weren't, what did you do
e) recognized, was wearing
f) was crossing, hit, injured