What were you doing yesterday?
.
Was he swimming yesterday?
Yes, he was
I was taking a shower ___ (while/when) the lights went out.
When
(When/ While)___ she was studying, her friends were waiting outside.
While
He broke his arm ___ he fell off his bike. A. when B. while
When
___ we were walking home, we saw a strange man. A. When B. While
While
