The other day while I was sitting on the train... to begin a story New buildings were going up everywhere. to show change or development Just as I was falling asleep, I heard a strange noise. something that continued before and after another action He was taking money from the till when no-one was looking. something happening again and again What were you doing at the time of the incident? something that happened before and after a particular time It was raining. something that continued for some time