RevisionOnline version Tense revision by Juan Sanders 1 Grupo 1 2 Grupo 2 3 Grupo 3 4 Grupo 4 5 Grupo 5 6 Grupo 6 7 Grupo 7 8 Grupo 8 While they were studying someone knocked at the door Paula was teaching German when a student started shouting While Ema was cooking his phone rang When the video finished everybody was watching attentively Before he sold the pasta he had written down many orders Before Paula's boyfriend came to visit her she had called him many times Before they ate dessert they had eaten ravioli and lasagne Before they bought their house my parents had chosen it carefully