6. By the time she had an accident , she had gone out to the food store.
$\rightarrow$ By the time S1 + V2 / V-ed + O , S2 + have / has + V3 / V-ed + O.
7. Before writting their assignments. The students read some materials.
$\rightarrow$ Before + clause of N / V-ing.
8. By the time that policeman arrived, the robber had escaped.
$\rightarrow$ By the time S1 + V2 / V-ed + O , S2 + have / has + V3 / V-ed + O.
9. Do you enjoy having a swim?
$\rightarrow$ Enjoy + V-ing : Thích một cái gì đó
10. He spent two hours cooking the meal
$\rightarrow$ S + spend / spent + time + V-ing + O.
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