Respuesta:Explicación: así es la forma correcta:1. Before I had looked after children, I had taken care of my brothers and sisters.2. When I finally got holiday time, I had been at the job for one year.3.I had not tidied the house before my parents came home.4. I was happy because I had sold more of my handmade jewellery than ever before.5. I had been a lifeguard for two years before I became a swimming teacher.6. The children had played in the sun for three hours before I remembered to give them sun cream!7. After Joe had eaten lunch, he went to his room.8. I did not get that job because I had not worked on the checkout before.