Отрицательные предложения сделать. 1. He was living in Moskow with his parents at that time. They were taking part in a concert at that tine. We were crossing the streer when the lights changed to red. The children were sleeping when the parents came home fron the concert.

Просто добавляем частицу NOT

1. He was not living in Mosсow with his parents at that time. They were not taking part in a concert at that time. We were not crossing the street when the lights changed to red. The children were not sleeping when the parents came home from the concert.