Verified answer

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)