She was doing/did her homework, when her dad was calling/called her.
was doing - called
At three o'clock, I ................................... . (work)
was working
The birds (sing), the sun (shine) and in the cafés people (chat)
were singing-was shining-were chatting
When the whistle blew, I ........................... (run)
ran / was running
I (study) while he (make) dinner.
was studying - was making
