Relier Pairs matching AVersion en ligne matching par Kristina Topalova 1 They were laughing at us when... 2 We were rehearsing for a school play last night when... 3 The alarm rang while... 4 Everyone was wearing their character costumes when... 5 A group of young children arrived while... we were waiting for the firefighters to come. we went outside to the playground. the teacher told them to stop. we were singing the last song. an embarrassing thing happened.