1: viết lại câu sao cho nghĩa không đối sử dụng từ gợi ý
1,David had gone home before we arrived
=> Before .........................................................
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..........................................