cíu á á á ét ô ét ----- Nội dung dịch tự động từ ảnh ----- 1. After they had eaten the shellfish, they began to feel sick. -> Before ... 2. Before they arrived at the airport, they had paid the taxi driver. -> After .. 3. The light had gone out before we got out of the office. → When .... 4. After she had explained everything dearly, we started our work. → By the time... 5. My father had watered all the plants in the garden by the time my mother came home. →Before ... 6. When I arrived home, my mother had tried to call me. -> Before ... 7. David had gone home before we arrived. After .... 8. I had had a cup of tea before I left for my office. -> After ..