2 As / When / While Cathy was
washing the dishes, she dropped a glass.
Cathy was washing the dishes when he dropped a glass.
3 As / When / While the children were
playing, their father came home.
The children were playing when their father came home.
4 As / When / While Robert was driving
home, he got a flat tyre.
Robert was driving home when he got a flat tyre.
5 As / When / While Mick and Charlie
were leaving the bank, the police surrounded them.
Mick and Charlie were leaving the bank when the police surrounded them.