1. David had gone home before we arrived.  After ....................................................................................................................... 2. We had lunch then we took a look around the shops.  Before .................................................................................................................... 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 .................................................................................................................... .......................................................................................