Раскрыть скобкиPeter ... (talk) on the phone when I came

Peter was talking on the phone when I came. - Когда я пришел, Питер разговаривал по телефону.

Peter wasn't talking on the phone when I came.

Was Peter talking on the phone when I came?

What was Peter doing when I came?

Who was talking on the phone when I came?

Was Peter talking on the phone or sleeping when I came?

Peter was talking on the phone when I came, wasn't he?

Past Continuous выражает действие, на фоне которого произошло другое действие, которое обязательно должно быть выражено Past Simple.

В Past Continuous действие носит длительный характер, а в Past Simple - краткий характер.