Viết lại câu dựa vào những từ cho sẵn

III. Viết lại câu dựa vào những từ cho sẵn.
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..............................................................................................