She ............. (have dinner) when the storm .......... (start).
She WAS HAVING DINNER when the storm STARTED
When mom ......... (come) home, we .................(sleeping). It was too late
When mom CAME home, we WERE SLEEPING. It was too late.
While I ........(sit) at my desk, my phone suddenly .......(ring)
While I WAS SITTING at my desk, my phone suddenly RANG.