Jack reading → phone rang → answered
Jack was reading a book.
The phone rang. (past simple)
He stopped reading and answered the phone. (past simple)
What happened? The phone rang.
What was Jack doing when the phone rang? He was reading a book.
What did he do when the phone rang? He stopped reading and answered the phone.
B. Past Simple vs Past Continuous
A: What did you do yesterday morning? (from 10 to 11.30)
B: We played tennis. (complete action)
A: What were you doing at 10.30?
B: We were playing tennis. (unfinished action)
Jack read a book yesterday. (= from beginning to end)
Did you watch the film on television last night?
It didn’t rain while we were on holiday.
Jack was reading a book when the phone rang.
Were you watching television when I phoned you?
It wasn’t raining when I got up.
I started work at 9 o’clock and finished at 4.30. At 2.30 I was working.
It was raining when we went out. (= it started raining before we went out)
I saw Lucy and Steve this morning. They were waiting at the bus stop.
Jenny fell asleep while she was reading.