1. He was having a bath when the phone rang.
Was he having a bath when the phone rang?
He wasn't having a bath when the phone rang.
2.She left the house at about 7 pm yesterday.
Did she leave the house at about 7 pm yesterday?
She didn't leave the house at about 7 pm yesterday.
3. I was cooking while Tom was reading.
Was I cooking while Tom was reading?
I wasn't cooking while Tom was reading.
4.She was sleeping at 6 pm yesterday afternoon.
Was she sleeping at 6 pm yesterday afternoon?
She wasn't sleeping at 6 pm yesterday afternoon.