Rewrite the sentences

Rewrite the sentences.

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 clearly, 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.......................................................................................................................................