1) What were you doing yesterday when your grandmother was working downstairs?
I was reading a book upstairs.
2) Did you hear anything strange?
I heard a dog barking
3) Where did you find your grandmother? What time was it?
I found her in the kitchen at 7 pm.
4) What did you do (were you doing) while waiting for the police to arrive?
I called my brother (I was calling my brother)